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ellsworthglass1

ellswo ... 12/31/2012

2007 GMC Yukon Denali 8 Cyl 6.2L

Engine

code for 2007 yukonpo121 engine po724 trans

1 Answer


Jimm

Jimm 1/1/2013

P0121 means Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem. P0121 occurs when the PCM has detected a throttle angle that is significantly higher or lower for the specified engine RPM (revolution per minute).

Possible Causes:

Open or short in the TPS wiring or circuit
Loose or contaminated TPS connector
Defective PCM

Possible Solutions:

Repair or replace TPS wiring or circuit
Tighten or replace TPS connector
Replace PCM

P0724 = Torque Converter/Brake Switch B Circuit High
The purpose of this circuit is to prevent the engine from stalling while driving in lock-up condition, when
brakes are suddenly applied.
When the brake pedal is depressed, this switch sends a signals to the ECM. Then the ECM cancels the operation of the lock-up clutch while braking is in progress.

INSPECT STOP LAMP SWITCH ASSY
CHECK HARNESS AND CONNECTOR(STOP LAMP SWITCH ASSY - ECM)

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Jimm

ellsworthglass1 1/2/2013

thank you jimm

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