P2101 on 2015-2022 Ram ProMaster City: Throttle Control Causes and Fixes

What's Unique About the 2015-2022 Ram ProMaster City

The 2.4L MultiAir 'Tigershark' engine used in the ProMaster City and other FCA vehicles (like the Jeep Compass, Cherokee, and Chrysler 200) has a known pattern of issues related to the electronic throttle body. While P2101 is a generic code, on this specific platform, it is very frequently caused by either carbon buildup interfering with the throttle plate's movement or an internal failure of the throttle body's motor or gears. Owners often experience the dreaded 'red lightning bolt' on the dash followed by a sudden loss of power, which points directly to this system.

Symptoms You May Notice

• Check Engine Light is on
• Electronic Throttle Control (ETC) warning light is on (red lightning bolt symbol)
• Vehicle enters 'limp mode' with drastically reduced engine power and throttle response
• Little to no acceleration when pressing the gas pedal
• Unstable or rough idle
• Vehicle may stall

Most Likely Causes

1. Dirty or Sticking Throttle Body 🔴 High Probability → Shop Fuel Injection Throttle Body Carbon and oil vapor from the crankcase ventilation system can build up in the throttle body bore and on the throttle plate, causing it to bind or stick. On the 2.4L MultiAir, this is a very common cause for this code, often being the first recommended fix.
   How to confirm: Remove the air intake hose from the throttle body and visually inspect the throttle plate and bore for a dark, sticky film of carbon buildup.
   Typical fix: Clean the throttle body thoroughly with a dedicated throttle body cleaner and a soft cloth or brush. Be careful not to spray cleaner directly into the electronic components. After cleaning, a throttle relearn procedure must be performed.
   Est. part cost: $5-$15 for cleaner
2. Failed Electronic Throttle Body Assembly 🔴 High Probability → Shop Fuel Injection Throttle Body If cleaning doesn't resolve the issue, the internal electric motor or plastic gears within the throttle body assembly have likely failed. This is a common failure point on these parts across the entire FCA 2.4L platform.
   How to confirm: If the code returns immediately after cleaning and performing a relearn, and the wiring is confirmed to be good, the throttle body is condemned. A scan tool can monitor commanded vs. actual throttle position to confirm a lack of response.
   Typical fix: Replace the entire electronic throttle body assembly. A throttle relearn procedure is required after installation.
   Est. part cost: $150-$350
3. Wiring or Connector Issue ⚪ Low Probability Vibration and heat in the engine bay can, over time, cause issues with the wiring harness or the connector at the throttle body. Corrosion is also a possibility.
   How to confirm: Visually inspect the wiring harness leading to the throttle body for any signs of chafing, melting, or broken wires. Unplug the connector and check for corrosion, moisture, or bent/loose pins.
   Typical fix: Repair the damaged section of the wire or clean/replace the connector pigtail.
   Est. part cost: $10-$30 for pigtail/repair supplies

Rare But Worth Checking

• Powertrain Control Module (PCM) Failure: → Shop Engine Control Module (ECM) This is very rare, but a faulty PCM could theoretically misinterpret sensor data or fail to properly control the throttle motor. This should only be considered after all other possibilities have been exhausted.

Diagnosis Steps

1. Confirm the presence of P2101 with an OBD-II scanner. Note any other codes present.
2. Turn the ignition off. Remove the air intake duct from the throttle body.
3. Visually inspect the throttle plate and bore for heavy carbon buildup.
4. If dirty, thoroughly clean the throttle body using a dedicated throttle body cleaner and a soft rag or toothbrush. Do not use harsh tools that could scratch the bore. Manually move the plate to clean all surfaces.
5. Inspect the wiring and connector at the throttle body for any signs of damage, corrosion, or loose pins.
6. Reassemble the intake duct.
7. Perform the Electronic Throttle Control (ETC) relearn procedure. A reliable manual method is: Turn the ignition to the 'ON' position (do not start the engine). Wait for dash lights/chimes to settle (about 10 seconds). Slowly press the gas pedal all the way to the floor. Slowly release the pedal completely. Turn the ignition 'OFF' and wait at least 10-15 seconds. Then start the engine. A professional scan tool can also initiate this relearn and is the most surefire method.
8. Clear the codes and perform a test drive. If the code and symptoms return, the throttle body assembly is likely faulty and needs to be replaced.
9. If replacing the throttle body, ensure you perform the ETC relearn procedure again after installation.

Parts You'll Likely Need

• Electronic Throttle Body Assembly (OEM #04891970AD (supersedes 4891970AC, 4891970AB)) — This is the most common part to fail and cause the P2101 code on this engine if cleaning does not resolve the issue. The motor, gears, and sensors are integrated into this one unit.
  Trusted brands: Mopar, Bosch, Spectra Premium, Dorman
  OEM price range: $250-$400
  Aftermarket price range: $150-$250
• Throttle Body Gasket (OEM #68359029AA) — It is best practice to replace the gasket anytime the throttle body is removed for cleaning or replacement to prevent vacuum leaks.
  Trusted brands: Mopar, Fel-Pro, Mahle
  OEM price range: $15-$20
  Aftermarket price range: $5-$10
• Throttle Body Cleaner — Often, simply cleaning the carbon buildup from the throttle plate and bore is enough to fix the problem.
  Trusted brands: CRC, Gumout
  OEM price range: N/A
  Aftermarket price range: $5-$15

Related Codes That Often Appear With This One

• P2110 — This code, 'Throttle Actuator Control System - Forced Limited RPM,' is often set alongside P2101. It indicates that the PCM has actively engaged limp mode because of the P2101 fault.
• P2100 — This code for 'Throttle Actuator Control Motor Circuit/Open' can appear with P2101 if there is an electrical circuit problem, such as a bad connection or internal motor failure.
• P2118 — 'Throttle Actuator Control Motor Current Performance' indicates an issue with the electrical current draw of the motor, often pointing to a binding throttle plate or failing motor, which is the root cause of P2101.

Technical Service Bulletins (TSBs) & Recalls

• TSB 09-007-19 REV. A / 09-006-20 REV. B: Details the official oil consumption verification test for dealers to perform on vehicles with the 2.4L engine, including the ProMaster City.
• Customer Satisfaction Notification W80: A notice sent to owners regarding the potential for higher-than-usual oil consumption and outlining the free inspection and repair process.
• Warranty Extension XB1 (X-B-1): FCA extended the powertrain warranty for certain vehicles with the 2.4L engine to cover repairs related to oil consumption, which could include a new long block if the vehicle fails the consumption test.

Platform-Specific Known Issues

• While not a direct cause of P2101, the 2.4L MultiAir engine in the ProMaster City is notorious for excessive oil consumption. FCA has issued Technical Service Bulletins (like TSB 09-007-19 REV. A) and customer satisfaction programs (W80) to address this. Owners may find their engine oil level is low between changes. This is a separate, but critical, issue for owners to monitor on this specific powertrain.

Mechanic-Grade Diagnostic Values

• Electronic Throttle Control (ETC) Motor Resistance — expected: 5 to 15 ohms. Failure: An open circuit (infinite resistance) or a short (near zero resistance) indicates a failed motor within the throttle body assembly.
• Throttle Position Sensor (TPS) Voltage (at sensor connector) — expected: Rises smoothly from ~0.5V (closed) to ~4.5V (wide open).. Failure: Erratic spikes, dropouts, or voltage outside the expected range indicates a faulty TPS.
• Live Data: Commanded vs. Actual Throttle Position — expected: Actual position should be within 2 degrees of the desired (commanded) position.. Failure: A difference greater than 2 degrees indicates a performance issue with the throttle body.
• System Voltage (at battery) — expected: 12.4–12.7V (engine off); 13.5–14.5V (engine running).. Failure: Low battery voltage, especially in extreme temperatures, can cause excessive current draw in the ETC motor and trigger a P2101 fault.

Scan Tool Commands That Help

• Professional Scan Tool (e.g., wiTECH, Autel, iCarsoft CR MAX): ETC Relearn / Throttle Adaptation Reset — This function must be used after cleaning or replacing the throttle body to reset the learned adaptive values in the PCM. In some cases where the old part was failing for a long time, the learned adaptations can be so far off that a manual relearn will not work, and a scan tool is the only way to correctly calibrate the new part.
• Professional Scan Tool (e.g., wiTECH, Autel, iCarsoft CR MAX): Throttle Follower Test / Actuator Test — This is a bidirectional control that allows the technician to command the throttle plate to open to specific percentages (e.g., 10%, 50%, 100%) with the engine off. It is used to verify if the throttle motor is physically responding to commands from the PCM, helping to distinguish between a mechanical failure (stuck plate, bad motor) and a wiring or sensor issue.

Wiring & Ground Locations

• Primary Engine/Transmission Ground Strap — A braided strap that connects from the transmission case to a bolt on the top of the driver-side transmission mount, near the bottom of the mount.. This is the primary ground for the entire engine and transmission assembly. A corroded or loose connection here can cause inconsistent voltage and data corruption for all engine sensors, including the electronic throttle body, leading to a variety of fault codes.
• Chassis Ground Point — A bolt stud near the underhood fuse box, often designated for negative power connections.. A poor ground connection at the main chassis point can cause system-wide electrical issues. When diagnosing elusive electronic faults, verifying this ground is clean and tight is a crucial step. Some owners have added a secondary ground cable from the engine block to this point as a preventative measure.

Real Owner Repair Stories

• promasterforum.com user (2018 Ram ProMaster City) — Vehicle went into limp mode with the red lightning bolt and check engine light on. Codes P2101 and P2110 were present.
  ❌ Tried (didn't work) Cleaning the throttle body., Replacing the throttle body with a new OEM part., Performing the manual throttle relearn procedure multiple times.
  ✅ What actually fixed it Disconnecting the negative battery terminal for over 30 minutes to perform a 'hard reset' of the Powertrain Control Module (PCM). After reconnecting the battery and starting the vehicle, the codes were gone and did not return.

OEM Part Supersession History

• 4891970AB, 4891970AC → 04891970AD — Standard part revision and update by the manufacturer for improved reliability or manufacturing process changes.
  Heads up: The latest part number, 04891970AD, is fully backward compatible with the previous versions and is the correct service replacement.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Excessive Oil Consumption 🔴 High — Very common. A class-action lawsuit was filed over this issue. It can manifest at various mileages. FCA issued warranty extensions and TSBs to address it. (Ref: TSB 09-007-19 REV. A; Customer Satisfaction Notification W80; Warranty Extension XB1)
• Transmission Unexpectedly Shifts to Neutral 🔴 High — Affects 2015-2016 models. A recall was issued to fix the problem. (Ref: FCA Recall S21 / NHTSA 16V-107)
• Premature Engine Failure / Cracked Cylinder Head 🔴 High — Less common than oil consumption, but reported by some owners of higher-mileage (approx. 80,000 miles) vans, particularly 2021 models.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used throttle body can be a cost-effective option if sourced from a low-mileage donor vehicle, as the failure is often due to electronic motor wear rather than a design flaw that affects all parts equally. Given the high cost of a new OEM part, a used unit from a reputable salvage yard with a warranty is a reasonable gamble.

Donor-vehicle mileage cap: roughly under 60000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Check for a clean throttle plate and bore; excessive carbon may suggest high mileage or poor engine health.
• Ensure the electrical connector pins are straight, clean, and free of corrosion.
• Verify the part number matches or is a compatible superseded number for your vehicle.
• Ask for the donor vehicle's VIN and mileage to verify its history.

OEM-only on this vehicle (don't cheap out):

• While not strictly 'OEM-only', using a Mopar or original equipment supplier (like Bosch) throttle body is highly recommended. Some aftermarket units can have calibration or longevity issues that cause the code to return prematurely.

Aftermarket brands forum-validated for this vehicle:

• Bosch (often the OEM supplier)
• Spectra Premium

Brands owners have reported issues with on this vehicle:

• Unbranded, no-name parts from online marketplaces should be avoided due to a high likelihood of premature failure or incorrect calibration.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0121 — Throttle Position Sensor 'A' Circuit Range/Performance. The TPS is integrated into the throttle body assembly. A sticking throttle plate due to carbon buildup, a primary cause of P2101, can cause the TPS to report readings outside its expected range, triggering this code simultaneously.
• P0221 — Throttle Position Sensor 'B' Circuit Range/Performance. Modern electronic throttle bodies use a second, redundant TPS for safety. An internal failure of the throttle body assembly, a common cause for P2101, can affect both sensors, leading to this companion code.
• P2111 — Throttle Actuator Control System - Stuck Open. This code is a direct result of the physical binding mentioned as a common cause. If carbon buildup prevents the throttle plate from closing properly, the PCM will detect it is stuck open and set this code along with the P2101 performance code.
• P2112 — Throttle Actuator Control System - Stuck Closed. This is the counterpart to P2111 and can be caused by the same issues as P2101. A failing internal motor or severe carbon buildup can prevent the throttle plate from opening, causing the PCM to log this code.
• P2135 — Throttle Position Sensor 'A'/'B' Voltage Correlation. This code is set when the PCM detects a disagreement between the two throttle position sensors. A failing electronic throttle body, a high-probability cause for P2101, often involves the failure of these internal sensors, leading to a correlation fault.

Frequently Asked Questions