P2138 on Jeep
Throttle/Pedal Position Sensor D/E Voltage Correlation
P2138 on Jeep vehicles indicates throttle/pedal position sensor d/e voltage correlation. Au7o has documented this code across 1 Jeep model — most commonly on Grand Cherokee. This code means the two (or three) signals from the accelerator pedal position / throttle position sensors disagree with each other — specifically sensors 'D' and 'E', which are typically the redundant signals built into the electronic accelerator pedal. Drive-by-wire systems use multiple sensors that should track together so the computer can trust the driver's input; when their voltages don't correlate, the computer can't be sure of the requested throttle and sets this code. As a safety response it usually puts the engine into a reduced-power 'limp' mode. It generally points to the pedal sensor assembly or its wiring.
Common Causes of P2138
- •Faulty accelerator pedal position sensor assembly
- •Corroded or loose pedal sensor connector
- •Chafed, shorted, or open wiring between pedal and ECM
- •Shorted-together signal wires in the pedal harness
- •Poor sensor ground or reference voltage
- •Moisture or contamination in the pedal connector
- •Faulty ECM/PCM (less common)
P2138 on Jeep by Model
Jeep Grand Cherokee(1 issue)
- ETC Warning or Limp Mode - Read the DTC Before Buying a Throttle Body2011-2022
The electronic-throttle-control warning lamp and reduced-power or limp mode are protective responses, not a diagnosis that the throttle body has failed. Depending on the stored DTC and application, the factory path may lead to a stuck or contaminated throttle plate, throttle motor or position-sensor response, accelerator-pedal sensors, a five-volt supply fault, damaged wiring or terminals, or a PCM issue. The old card's thermostat shopping claim is not part of the cited ETC diagnostic path, and a throttle body should not be ordered from the warning lamp alone.
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View P2138 across all makes →Frequently Asked Questions
What does P2138 mean on Jeep?▼
P2138 stands for "Throttle/Pedal Position Sensor D/E Voltage Correlation." This code means the two (or three) signals from the accelerator pedal position / throttle position sensors disagree with each other — specifically sensors 'D' and 'E', which are typically the redundant signals built into the electronic accelerator pedal. Drive-by-wire systems use multiple sensors that should track together so the computer can trust the driver's input; when their voltages don't correlate, the computer can't be sure of the requested throttle and sets this code. As a safety response it usually puts the engine into a reduced-power 'limp' mode. It generally points to the pedal sensor assembly or its wiring. On Jeep specifically, this code is documented across 1 model.
What causes P2138 on Jeep vehicles?▼
Common causes on Jeep: Faulty accelerator pedal position sensor assembly, Corroded or loose pedal sensor connector, Chafed, shorted, or open wiring between pedal and ECM, Shorted-together signal wires in the pedal harness, Poor sensor ground or reference voltage. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2138 on a Jeep?▼
Repair costs vary widely depending on the root cause and specific Jeep model.
Which Jeep models have P2138 documented?▼
Au7o has documented P2138 on 1 Jeep model: Grand Cherokee.