P1515 - FAULT CODE - OBD2

P1515 BUICK, CADILLAC, CHEVROLET, GMC: CONTROL MODULE THROTTLE ACTUATOR POSITION PERFORMANCE

The commanded throttle position is compared to the actual throttle position, which is based on information provided by the sensors that monitor that parameter, and other limiting factors.

Both the actual and expected position must be within a calibrated range of each other. Therefore, the PCM (Powertrain Control Module) continuously monitors this value to verify that the given requirements are met.

The P1515 OBDII fault code is a code that Buick, Cadillac, Chevrolet, and GMC manufacturers use to indicate that the PCM has encountered a throttle position performance problem. The reason is that the difference between the predicted and actual throttle position exceeds the calibrated amount.

• Check Engine lamp illuminated.
• Noticeable reduction in engine power.
• Engine enters a fail-safe mode.

Factors leading to the setting of the P1515 OBD2 diagnostic code include:

• The Throttle Actuator Control Module (TAC) could have damage to its wiring.
• The TAC Module could be defective.
• A Throttle Position Sensor could be in poor condition.
• The throttle plate may be stuck.
• The throttle body could have damage.

The steps to follow to correct the DTC P1515 OBDII code are:

• Consult the Technical Service Bulletins.
• Check if codes such as P1120, P1220, P1221, P1271, P1275 and P1280 are stored. If so, you must first diagnose these codes.
• Inspect the Throttle Actuator Control Module wiring for common damage. Repair any burns, corrosion or wear that may be present.
• Check the throttle body to verify that the throttle valve does not have a sticking condition. If so, make the appropriate adjustments.
• Perform electrical tests on the TAC Module control circuits to verify that the resistance is adequate. If high resistance is detected, make the necessary repairs.