What does code P1297 mean?

Q: What does code P1297 mean?

No Change In MAP From Start To Run. P1297 on a GM vehicle means the engine control module (ECM) compared the manifold absolute pressure (MAP) sensor reading at key-on with the reading once the engine started and found no meaningful change. The ECM expects manifold vacuum to pull the MAP signal down noticeably within seconds of startup, and this code sets when that expected drop never arrives.

DTC codes / GM codes / P1297

P1297 · GMNo Change In MAP From Start To Run

P1297 on a GM vehicle means the engine control module (ECM) compared the manifold absolute pressure (MAP) sensor reading at key-on with the reading once the engine started and found no meaningful change. The ECM expects manifold vacuum to pull the MAP signal down noticeably within seconds of startup, and this code sets when that expected drop never arrives.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.