P2135 on 2007-2012 Dodge Caliber: Throttle Position Sensor Correlation Error Fixes

What's Unique About the 2007-2012 Dodge Caliber

The Dodge Caliber, along with its platform-mates the Jeep Compass and Patriot, uses a 'World Engine' with an electronic throttle body where the dual throttle position sensors are an integral, non-serviceable part. While this code can be caused by wiring or pedal sensor issues on other vehicles, the throttle body assembly itself is the most frequent point of failure on this platform. The electronic contacts and motor inside the sealed sensor unit wear out over time, causing the voltage signals to become erratic, drop out, or stop mirroring each other, which triggers the correlation fault.

Symptoms You May Notice

• Check Engine Light is on
• Electronic Throttle Control (ETC) or 'lightning bolt' warning light is on
• Vehicle enters 'limp mode' with drastically reduced engine power
• Hesitation, stumbling, or surging upon acceleration
• Unstable, high, or erratic idle
• Engine may stall unexpectedly
• Vehicle struggles to accelerate or exceed a certain speed (e.g., 30 mph)

Most Likely Causes

1. Faulty Electronic Throttle Body Assembly 🔴 High Probability → Shop Fuel Injection Throttle Body The integrated throttle position sensors are a well-documented, high-failure rate item on the Chrysler MK platform 🎬 See how to replace the throttle body on this platform. (Caliber, Compass, Patriot). The internal electronic components and motor wear out from constant micro-adjustments, leading to mismatched signals. The sensors are not sold separately, requiring replacement of the entire assembly.
   How to confirm: Use an OBD-II scanner with live data capability to graph the voltage of TPS 'A' (or TPS1) and TPS 'B' (or TPS2). With the key on and engine off, slowly press the accelerator pedal to the floor and release it. The two signals should mirror each other smoothly. A failing throttle body will show one or both signals dropping out, spiking, becoming erratic, or not tracking with the other.
   Typical fix: Replace the entire throttle body assembly. 🎬 Watch this step-by-step Dodge Caliber throttle body replacement guide. After replacement, a throttle relearn procedure is required. This can often be done without a scan tool by turning the key to the 'ON' position for 10-15 seconds, slowly pressing the gas pedal to the floor and releasing it, then turning the key 'OFF' for 10 seconds before starting the engine.
   Est. part cost: $75-$200

Rare But Worth Checking

• Wiring Harness or Connector Issue: While less common than throttle body failure, a damaged wire or corroded/loose pin in the connector at the throttle body can cause the same symptoms. Wiggling the harness while monitoring live sensor data can sometimes expose an intermittent connection issue. It's worth inspecting the wiring before replacing the part.
• Faulty Powertrain Control Module (PCM): → Shop Engine Control Module (ECM) This is very rare. A PCM failure can cause false codes, but it should only be considered a possibility after the throttle body and wiring have been thoroughly checked and ruled out.

Diagnosis Steps

1. Connect an OBD-II scanner and confirm P2135 is present. Note any other codes, such as P0221 or P0122, which further point to the throttle body sensors.
2. Using the scanner's live data function, select and graph the voltage readings for Throttle Position Sensor 1 and Throttle Position Sensor 2.
3. With the Key On, Engine Off (KOEO), slowly depress the accelerator pedal from fully released to wide open, then slowly release it back. Observe the two voltage graphs.
4. The graphs should be smooth and mirror each other's movement. One will typically range from ~0.5V to ~4.5V, while the other might be inverted or operate in a different range, but their movement must be correlated.
5. If you see any glitches, spikes, flat spots, or dropouts in one or both of the sensor readings as the pedal is moved, the throttle body is faulty and needs replacement.
6. If the sensor data looks perfectly smooth, turn the ignition off. Disconnect the throttle body electrical connector and inspect it for corrosion, moisture, or bent/loose pins.
7. Inspect the wiring harness leading to the throttle body for any signs of chafing, melting, or physical damage.
8. If the wiring and connector are in good condition and the sensor data was erratic, the throttle body assembly is confirmed as the cause and should be replaced.
9. After replacing the throttle body, clear the trouble codes and perform a throttle relearn procedure to calibrate the new part with the PCM.

Parts You'll Likely Need

• Electronic Throttle Body Assembly (OEM #04891735AC) — This is the most common failure point for P2135 on the Dodge Caliber, as the internal, non-serviceable sensors fail.
  Trusted brands: Mopar, Standard Motor Products (SMP), Hitachi, Bosch, Dorman
  OEM price range: $150-$250
  Aftermarket price range: $75-$150

Related Codes That Often Appear With This One

• P0221 - Throttle/Pedal Position Sensor/Switch 'B' Circuit Range/Performance
• P0122 - Throttle/Pedal Position Sensor/Switch 'A' Circuit Low
• P2110 - Throttle Actuator Control System - Forced Limited RPM

Technical Service Bulletins (TSBs) & Recalls

• While no specific TSB for P2135 on the Caliber was found, GM TSB 11-06-04-007B for a similar engine describes the P2135 fault logic as the difference between TP Sensor 1 and TP Sensor 2 exceeding a calibrated value for more than 2 seconds, which is the same principle applied here.

Platform-Specific Known Issues

• The electronic throttle body is a well-documented, high-failure rate item on the Chrysler MK platform (Caliber, Compass, Patriot). The issue is so common that many owners diagnose and replace the part themselves as a first step when the 'lightning bolt' light appears.

Mechanic-Grade Diagnostic Values

• TPS 1 Signal Voltage — expected: Approx. 0.5V at closed throttle, sweeping smoothly to ~4.5V at wide-open throttle (WOT).. Failure: Voltage is erratic, has dropouts, glitches, or does not sweep smoothly when the throttle is opened manually (with KOEO).
• TPS 2 Signal Voltage — expected: Approx. 4.5V at closed throttle, sweeping smoothly down to ~0.5V at WOT. This is typically inverse to TPS 1.. Failure: Voltage is erratic, has dropouts, or does not mirror the movement of TPS 1. The sum of TPS 1 and TPS 2 voltages should consistently equal ~5.0V.
• 5V Reference at Throttle Body Connector — expected: Stable 5.0V with Key On, Engine Off (KOEO).. Failure: Voltage is low, high, or absent, indicating a wiring or PCM issue.
• Sensor Ground at Throttle Body Connector — expected: Less than 0.1V (100mV) with KOEO.. Failure: Voltage is higher than 0.1V, indicating a poor ground connection which can cause erratic sensor readings.

Wiring & Ground Locations

• Throttle Body Connector (6-pin) — Directly on the electronic throttle body, top of the engine.. This is the primary connection point for all power, ground, and signal wires for the two internal throttle position sensors and the throttle motor. Corrosion or loose pins here are a common cause of P2135.
• G102 — On the left side of the engine compartment.. This ground point serves the Powertrain Control Module (PCM). A poor connection at G102 can cause a variety of engine codes, including false sensor correlation faults.
• G103 — On the top left side of the transaxle.. This is another critical ground for the PCM. Verifying this ground is clean and tight is a key step if wiring is suspected.
• G110 — On the right frame rail, located just ahead of or below the windshield washer reservoir.. While related to other codes in a documented case, poor grounds in this area (like the Z916 ground circuit to G110) can cause multiple, seemingly unrelated circuit-high codes and are worth inspecting for corrosion on any Caliber/Patriot.

Real Owner Repair Stories

• Reddit r/AskMechanics user (2007 Dodge Caliber 2.0L CVT) — Permanent P0123 (TPS 1 Circuit High), limp mode, erratic idle.
  ❌ Tried (didn't work) Replacing the throttle body, Replacing the throttle body connector pigtail
  ✅ What actually fixed it The user suspected a faulty PCM. During a previous connector repair, two pins were accidentally swapped and the engine was started, which likely damaged the driver circuit inside the PCM. The final fix would be PCM replacement.

Model Year Variations Within This Range

• 2007-2012: Some aftermarket throttle body manufacturers, like Dorman, note a difference in the throttle body's electrical connector. Buyers are advised to check if their harness has a single row of pins or a dual stacked row of pins to ensure they order the correct replacement part.

Diagnostic Flowchart

Other Known Issues on This Vehicle

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

• Premature Failure of Front Lower Control Arms and Ball Joints 🔴 High — Very common, often appearing before 60,000 miles. Can cause clunking noises, poor alignment, uneven tire wear, and in severe cases, wheel separation.
• Rusted Front and Rear Subframes 🔴 High — Widespread issue, especially in salt-belt regions. The subframe can rust to the point of structural failure, making the vehicle unsafe to drive. An extended warranty/recall existed but has since expired for most vehicles. (Ref: Extended Warranty X58 (Now Expired))
• CVT Transmission Overheating 🟠 Medium — Common on vehicles equipped with the CVT. During prolonged highway driving, the transmission can overheat, triggering a warning light and forcing the vehicle into a reduced power mode until it cools down.
• Alternator Failure 🟠 Medium — Alternators are a common failure item, leading to a dead battery, dimming lights, whining noises, and various electrical issues.
• Water Leaks from Sunroof Drain Tubes 🟡 Low — The sunroof drain tubes are prone to clogging or becoming disconnected, causing water to leak into the headliner, A-pillars, and footwells, potentially damaging electronics.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used OEM throttle body from a low-mileage donor vehicle can be a cost-effective alternative to a new aftermarket part. Given the high failure rate, it's a gamble, but it can work if the donor part is significantly newer or has very low mileage.

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 the date code on the part if visible.
• Inspect the electrical pins for any signs of corrosion or damage.
• Ensure the throttle plate moves smoothly by hand (with the part off the car) and isn't binding.
• Ask for the VIN of the donor car to check its history and mileage if possible.

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

• Powertrain Control Module (PCM) - Due to VIN programming and security requirements, a new or professionally refurbished and programmed unit is essential if the PCM is determined to be the cause.

Aftermarket brands forum-validated for this vehicle:

• Hitachi
• Bosch
• Standard Motor Products (SMP)

Brands owners have reported issues with on this vehicle:

• Some owners have reported premature failures with unbranded, 'white-box' parts from online marketplaces. Dorman offers an 'OE FIX' version with an improved non-contact Hall effect sensor and shaft seal to address common failure modes.

Real Owner Stories

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

Related OBD-II Codes

• P0221 — A companion code often present with P2135 that specifically points to a range or performance problem with the throttle position sensor circuit.
• P0122 — A related code indicating low input in the throttle position sensor circuit, frequently seen alongside P2135 during a throttle body failure.

Frequently Asked Questions