P2119 on 2011-2015 GMC Savana: Throttle Body Performance Causes and Fixes

What's Unique About the 2011-2015 Gmc SAVANA

For this generation of GMC Savana and its twin, the Chevrolet Express, the electronic throttle control system is a known point of attention, especially on high-mileage work vans. GM issued a Technical Service Bulletin (TSB #PIP4578B) that includes code P2119, acknowledging issues like idle surge and reduced engine power. The bulletin explains that as carbon builds up, the PCM learns to open the throttle plate more to compensate. Eventually, it can no longer compensate, or if the throttle body is cleaned without resetting the learned values, it can trigger this code. GM also issued a special coverage bulletin (#11273A) for 2008-2011 models due to a known flaw in the throttle position sensor.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Reduced Engine Power message on the dashboard
• Check Engine Light is on
• Vehicle has poor or delayed acceleration
• Unstable or rough idle
• Stalling
• Hesitation when pressing the accelerator from a stop.

Most Likely Causes

1. Dirty Throttle Body 🔴 High Probability → Shop Fuel Injection Throttle Body As mentioned in TSB #PIP4578B, high-mileage vehicles are susceptible. Over time, carbon and gunk from the PCV (Positive Crankcase Ventilation) system build up around the throttle plate and bore, restricting its movement and causing it to stick.
   How to confirm: Remove the air intake tube connected to the throttle body and visually inspect for a black, sticky film around the throttle plate and the bore it sits in. The plate may feel sticky or slow to move when pushed gently with a finger (with the engine off).
   Typical fix: Thoroughly clean the throttle body bore and plate with a dedicated throttle body cleaner and a soft brush or rag. 🎬 Watch: How to clean your throttle body and fix P2119. This often restores proper movement and resolves the code. An 'Idle Learn Reset' must be performed with a scan tool after cleaning to prevent the code from returning.
   Est. part cost: $5-$15
2. Failing Throttle Body Assembly 🟡 Medium Probability → Shop Fuel Injection Throttle Body The internal components, including the electric motor and the integrated throttle position sensor (TPS), can wear out over time. GM acknowledged a known flaw in the TPS for 2008-2011 models with a special coverage bulletin (#11273A). A GM TSB (PIP5513) notes that the throttle body should not be replaced for P2119 alone, but if other codes are present or diagnostics point to an internal fault, replacement is necessary.
   How to confirm: If a thorough cleaning and idle relearn do not fix the issue, the problem is likely internal. A mechanic can use a scan tool to monitor the TPS voltage for erratic readings or command the throttle open and closed to check for response issues. A failure of the internal motor or sensor will necessitate replacement.
   Typical fix: Replace the entire throttle body assembly. For some years, the Throttle Position Sensor (TPS) is available separately and can be replaced, but this often requires an ECM reprogram. Aftermarket and OEM (ACDelco) options are available. A throttle relearn procedure is required after installation.
   Est. part cost: $100-$250
3. Wiring or Connector Issues ⚪ Low Probability Engine vibrations and heat can cause wiring to fray or connectors to become loose or corroded over the vehicle's long service life. The main connector at the throttle body is a common point to inspect. Poor engine grounds, such as G103 on the cylinder head, can also cause erratic sensor behavior.
   How to confirm: Visually inspect the wiring harness leading to the throttle body for any signs of damage, chafing, or melting. Unplug the connector and check for corrosion, moisture, or bent/loose pins. Check engine ground connections for tightness and corrosion.
   Typical fix: Repair the damaged section of wire, clean/replace the connector, or clean/tighten engine ground points.
   Est. part cost: $5-$50

Rare But Worth Checking

• Powertrain Control Module (PCM) Fault: This is very rare. Before suspecting the PCM, all other possibilities, especially the throttle body itself and its wiring, should be exhaustively ruled out. This is typically a last-resort diagnosis.

Diagnosis Steps

1. Check for other DTCs. P2119 often appears with other throttle-related codes that can help pinpoint the issue.
2. Visually inspect the throttle body. Remove the air intake hose and look for heavy carbon buildup around the throttle plate and bore.
3. Clean the throttle body. With the key off, spray throttle body cleaner on a rag and wipe the plate and bore clean. You can gently push the plate open to clean behind it. Do not spray harsh chemicals directly into the electronic components.
4. Perform a throttle relearn procedure. This is a critical step. According to TSB PIP4578B, this must be done with a GM Tech 2 or equivalent scan tool by accessing the 'Module Set Up' or 'Special Functions' menu and selecting 'Idle Learn Reset'. If a scan tool is not available, a manual procedure of idling the engine for 3 minutes, turning the ignition off for 60 seconds, and idling again for 3 minutes may work.
5. Inspect the wiring. Check the connector and harness at the throttle body for any visible damage, corrosion, or loose connections. Also check key engine ground locations like G103 on the passenger side cylinder head.
6. Test with a scan tool (if available). Monitor the live data for the throttle position sensors. The readings should be smooth as the throttle is opened and closed. Command the throttle actuator to check for proper response.
7. If cleaning and wiring checks fail, replace the throttle body assembly or the TPS sensor if available separately.

Parts You'll Likely Need

• Throttle Body Assembly (OEM #12670839) — If a thorough cleaning doesn't resolve the code, the internal motor or sensors have likely failed, requiring replacement of the complete assembly. Note: The part number 12670839 is listed for many GM vehicles but may not be correct for the V8 Savana; always verify by VIN.
  Trusted brands: ACDelco (GM Genuine), Bosch, Hitachi
  OEM price range: $180-$250
  Aftermarket price range: $100-$180
• Throttle Body Cleaner — This is the first and most common fix. A can of specialized cleaner is needed to remove the carbon buildup that causes the throttle plate to stick.
  Trusted brands: CRC, Gumout, Berryman
  OEM price range: N/A
  Aftermarket price range: $5-$15

Related Codes That Often Appear With This One

• P0121 — Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance. This code is often seen with P2119 as it directly relates to the sensor that measures the throttle plate's angle.
• P1516 — Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance. This is a GM-specific code that indicates a problem between the TAC module and the throttle body's actual position, often caused by the same carbon buildup.
• P2101 — Control Module Throttle Actuator Control Motor Circuit Range/Performance. This code points to an issue with the electric motor that moves the throttle plate.
• P2135 — Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation. This code indicates a disagreement between the two throttle position sensors inside the throttle body, 🎬 Watch a technician diagnose P2119 and P2135 correlation codes. a common failure mode that can accompany P2119.

Technical Service Bulletins (TSBs) & Recalls

• PIP4578B: Mentions DTC P2119 in the context of idle surge and reduced power on high-mileage vehicles. Explains that carbon buildup causes the PCM to learn a new throttle angle, and cleaning requires an idle learn reset via a scan tool to prevent code recurrence.
• PIP5513: Advises against replacing the throttle body for P2119 as a sole code and to diagnose other codes first.

Platform-Specific Known Issues

• A GM Technical Service Bulletin (PIP4578B) directly mentions P2119 in relation to idle surge and reduced engine power on high-mileage vehicles, confirming this is a recognized issue. It states that as carbon builds, the PCM adapts; cleaning without an idle learn reset will cause problems.
• Another TSB (PIP5513) cautions technicians not to replace the throttle body for a P2119 code alone, as it can be set in conjunction with other codes that are the root cause. Diagnosis of any accompanying codes is critical.
• A YouTube video from 'The Car Doctor Channel' specifically addresses this issue on a 2014 GMC Savana, confirming that a 'carbon fest' in the throttle body is a common cause for reduced power mode and codes like P1516 and P2119. The video emphasizes that a scan tool-initiated idle learn reset is not optional for a successful repair.

Mechanic-Grade Diagnostic Values

• Voltage at the throttle actuator's power feed (engine running) — expected: 11.5 V – 13.5 V. Failure: Persistent voltage below 11.5V suggests a power supply issue to the throttle body.
• Continuity/Resistance of the throttle actuator signal wire — expected: ≤ 0.5 Ω. Failure: Higher resistance indicates a problem in the wiring harness between the ECM and the throttle body.

Scan Tool Commands That Help

• GDS2 / Tech 2 or equivalent: Idle Learn Reset — This function must be used after cleaning or replacing the throttle body to clear the old learned idle values from the PCM. Failing to do so is a primary cause of the code returning after a repair, as noted in TSB PIP4578B.
• GDS2 / Tech 2 or equivalent: Throttle Position (TP) Sensor Live Data — Monitor the TP Sensor 1 and TP Sensor 2 percentages or voltages while slowly pressing the accelerator pedal with the key on, engine off. The values should change smoothly with no glitches or dropouts. This helps confirm if the sensor is failing internally.

Wiring & Ground Locations

• G103 — On the front of the passenger side (right side) cylinder head.. This is a primary engine ground. A loose or corroded connection at G103 can cause erratic voltage and signal issues for various engine sensors, including the electronic throttle body, leading to performance codes like P2119.
• Main PCM Ground — On top of the engine block, often near the back.. This is the most important ground for the Powertrain Control Module (PCM). If this ground is compromised, the PCM cannot get accurate readings from its sensors, which can cause a wide range of false codes and drivability problems, including throttle control faults.
• Throttle Body Connector — The 6-pin or 8-pin electrical connector directly on the throttle body assembly.. This is the direct interface for power and signal to the throttle actuator motor and position sensors. Corrosion, moisture, or loose pins in this connector are a common cause of intermittent throttle control faults.

Real Owner Repair Stories

• YouTube channel 'Phillip Bailey' (2011 GMC Savana with 271,000 km) — Check Engine Light on, 'Reduced Power' message, and codes P2135 and P2119.
  ❌ Tried (didn't work) The video directly proceeds to the final fix, but implies that simply clearing the codes would not work.
  ✅ What actually fixed it The Throttle Position Sensor (TPS) on the side of the throttle body was replaced with a new part from the dealer (GM Part No. 19259452). After replacement, the Engine Control Module (ECM) had to be reprogrammed/updated using GM's Techline Connect software. This confirms that for some models, the sensor can be replaced separately from the entire throttle body, but a software update is mandatory.

OEM Part Supersession History

• Entire Throttle Body Assembly → GM Part No. 19259452 (Throttle Position Sensor only) — Initially, GM required replacement of the entire throttle body for a sensor failure. Due to high failure rates, they later made the TPS available as a separate, serviceable part.
  Heads up: Replacing only the TPS sensor requires a mandatory ECM/PCM software update via a tool like GM Techline Connect to function correctly.

Model Year Variations Within This Range

• 2008-2011: GM issued Special Coverage bulletin #11273A for these model years, which includes the 2011 Savana. It extended the warranty on the throttle position sensor to 10 years or 120,000 miles, acknowledging a known factory flaw that causes 'Reduced Engine Power' and codes like P2135.