The P1296 code on your 2020 Dodge Charger indicates a loss of the 5-volt reference signal to the manifold absolute pressure (MAP) sensor. This Stellantis-specific code affects your Charger's 3.6L Pentastar V6, 5.7L HEMI, or 6.4L 392 HEMI engine's ability to accurately measure intake manifold pressure for proper fuel delivery and timing calculations.
Understanding P1296 on Charger
The MAP sensor requires a stable 5-volt reference from the PCM to measure intake manifold pressure. This pressure reading is critical for calculating engine load, fuel injection timing, and quantity. Code P1296 sets when the 5-volt reference is missing or too low, causing incorrect MAP readings and engine performance issues.
Common Symptoms
- Check engine light on
- Poor acceleration and performance
- Rough or unstable idle
- Black smoke from exhaust (running rich)
- Hard starting
- Decreased fuel economy
- Engine stalling
Primary Causes
- Damaged wiring to MAP sensor
- Short in 5-volt reference circuit
- Faulty MAP sensor with internal short
- Other sensor shorting shared 5-volt circuit
- Corroded MAP sensor connector
- PCM 5-volt reference failure
- Wiring harness damage from heat or rodents
Diagnostic Procedure for 2020 Charger
Measure voltage at the MAP sensor 5-volt reference pin with key on, engine off. Should read 4.9-5.1V. If absent or low, disconnect the MAP sensor and retest - if voltage returns, MAP sensor is shorted. Identify other sensors on the same 5-volt reference circuit and disconnect one at a time to find a shorting sensor. Trace wiring for damage. Test PCM output at the PCM connector.
Repair Solutions
Replace any sensor found to be shorting the 5-volt circuit. Repair damaged wiring using proper splicing techniques. Replace corroded connectors. If MAP sensor is faulty, replacement is straightforward and affordable. In rare cases of PCM 5-volt supply failure, PCM replacement and reprogramming is required. Verify stable 5-volt reference after repairs.