Check engine light on

GAITHER TUCKER

MEMBER
2003 DODGE RAM
5.9L
6 CYL
4WD
MANUAL
150,000 MILES

Have codes P2122 and P2127 code which is a throttle pedal position code. Have replaced the throttle position sensor with a new one set at factory. Codes are still there. Engine runs fine with an occasional hesitation. Does not appear to be a major problem but the check engine light is always on.

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon.

2122 is for the pedal sensor. Before replacing I would verify the 5 volt reference circuit to be sure it is not a wiring issue.

Roy

Symptom/DTC P2122
Descriptor
Accelerator Pedal Position Sensor # 1 Low
Low Voltage At The App Sensor
Probable Causes
5 Volt Supply Circuit Open
5 Volt Supply Circuit Shorted to Ground
Accelerator Pedal Position (APP) Sensor
Accelerator Pedal Position Sensor (APPS)
Accelerator Pedal Position Sensor (APPS) 1 Signal Circuit Shorted to Ground or Return
Accelerator Pedal Position Sensor (APPS) 1 Supply Circuit Shorted to Ground or Return
Accelerator Pedal Position Sensor (APPS) No. 1 Signal Circuit Open
Accelerator Pedal Position Sensor (APPS) No. 1 Signal Circuit Shorted to Ground
Accelerator Pedal Position Sensor (APPS) No. 1 Signal Circuit Shorted to Sensor Return Circuit
Accelerator Pedal Position Sensor (APPS) No. 1 Sweep
Engine Control Module (ECM)
Intermittent Condition
Open Accelerator Pedal Position Sensor (APPS) 1 Signal Circuit
Open Accelerator Pedal Position Sensor (APPS) 1 Supply Circuit
Open Circuit On the Ratiometric Wire
Open Circuit On the Supply Wire
Powertrain Control Module (PCM)
Ratiometric Circuit Shorted to Accelerator Pedal Position Sensor (APPS) Return, Battery Negative, or Sensor 1 Return
Ratiometric Circuit Shorted to Hot Idle Switch Circuit
Ratiometric Circuit Shorted to Idle Switch Circuit
Supply Circuit Shorted to Accelerator Pedal Position Sensor (APPS) Return, Battery Negative, or Sensor 1 Return
Wiring Harness or Connectors