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1998 JEEP CHEROKEE
2.5L I4•AWD•AUTOMATIC•gas
11 active safety recalls on this vehicle — view recalls
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Repairs0Labor506Torque4343Fluid10DTC893Battery1Maintenance0Recalls11
P1296moderate severityPowertrain

MAP Sensor Reading Exceeds Barometric Pressure

on 1998 Jeep Cherokee 2.5L I4 · 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

  1. Compare MAP sensor reading at key-on engine-off to barometric pressure
  2. Inspect MAP sensor vacuum hose for leaks or disconnection
  3. Test MAP sensor output voltage range
  4. Check 5V reference circuit
  5. Verify MAP sensor wiring for shorts

Repair notes

Replace the MAP sensor if its reading exceeds barometric pressure with the engine off.

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