The P1297 code on your 2023 Dodge Challenger indicates a loss of the 5-volt reference signal to the throttle position sensor. This Stellantis-specific code critically affects your Challenger's 3.6L Pentastar V6, 5.7L HEMI, 6.4L 392 HEMI, or supercharged 6.2L Hellcat engine's electronic throttle control system.
Understanding P1297 on Challenger
The throttle position sensor (TPS) requires a stable 5-volt reference signal from the PCM to accurately report throttle position. Code P1297 sets when this reference voltage is missing or below specification, preventing accurate throttle position readings and potentially causing reduced engine power or limp mode activation.
Common Symptoms
- Check engine light on
- Reduced engine power mode
- Limited throttle response
- Engine may not rev above idle
- Hesitation or stumbling
- Erratic idle
- Vehicle may enter limp mode
Primary Causes
- Damaged 5-volt reference wire
- Short circuit in 5-volt reference circuit
- Faulty throttle body with internal short
- Another sensor on shared 5-volt circuit shorting
- Corroded PCM connector
- PCM 5-volt reference supply failure
- Wiring harness damage
Diagnostic Procedure for 2023 Challenger
With key on, engine off, measure voltage at the TPS 5-volt reference wire - should be 4.9-5.1V. If low or absent, check for other sensors sharing the same 5-volt reference circuit. Disconnect other sensors one at a time to identify if a short in another sensor is pulling down the voltage. Inspect wiring for damage or shorts to ground. Test PCM 5-volt reference output at the PCM connector.
Repair Solutions
If another sensor is shorting the 5-volt circuit, replace that sensor. Repair any damaged wiring in the 5-volt reference circuit. If the throttle body has an internal short, replacement is required. In rare cases where the PCM 5-volt supply has failed, PCM replacement and reprogramming may be necessary. Clear codes and verify stable 5-volt reference under all conditions.