P1296moderate severityPowertrain
MAP Sensor Reading Exceeds Barometric Pressure
on 1997 Jeep Cherokee 4.0L I6 · AWD
What this code means
The PCM has detected that the MAP sensor reading exceeds the barometric pressure reading, which is physically impossible under normal conditions. This indicates a sensor fault or a significant pressure anomaly in the intake manifold.
Symptoms
- Check Engine Light
- Poor engine performance
- Rough idle
- Black smoke from exhaust
- Poor fuel economy
Common causes
- Faulty MAP sensor
- MAP sensor vacuum hose disconnected or leaking
- Short circuit in MAP sensor wiring
- PCM reference voltage issue
- Intake manifold pressure anomaly
Diagnostic steps
- Compare MAP sensor reading at key-on engine-off to barometric pressure
- Inspect MAP sensor vacuum hose for leaks or disconnection
- Test MAP sensor output voltage range
- Check 5V reference circuit
- Verify MAP sensor wiring for shorts
Repair notes
Replace the MAP sensor if its reading exceeds barometric pressure with the engine off.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1