Skip to content
GTECH Calibration
Portal

P1297

No Change In MAP From Start To Run.

  • Dodge
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
2
AreaFuel and air metering (injector circuit)
97
FaultThe specific fault in that area

What it means

P1297 on a Dodge means the engine control module saw no meaningful change in the manifold absolute pressure (MAP) sensor signal between key-on (engine off) and the engine running. With the engine running, manifold pressure should drop well below atmospheric pressure, so the module treats an unchanged reading as a MAP sensor fault or a problem with the vacuum supply to it.

Symptoms

  • Engine warning light on
  • Rough or unstable idle
  • Hesitation or poor throttle response
  • Poor fuel economy
  • Hard starting or stalling in some cases

Possible causes

  • Faulty MAP sensor stuck at one readinglikely
  • Blocked, split, disconnected or kinked vacuum hose or port to the MAP sensor (on vacuum-fed sensors)likely
  • Wiring or connector fault in the MAP sensor supply, ground or signal circuit (open, short or high resistance)possible
  • Large vacuum leak or manifold fault causing manifold pressure to stay near atmosphericpossible
  • Carbon or debris blocking the MAP sensor port on the manifoldpossible
  • Fault inside the engine control modulerare

How to diagnose

  1. Read freeze frame data and any other stored codes, especially other MAP, throttle position or sensor supply voltage codes, as they point to a shared circuit fault.
  2. Check the live MAP reading with the key on engine off, then at idle. It should read near atmospheric pressure at key-on and drop noticeably at idle. Compare with the manufacturer's specification for the engine.
  3. Inspect the MAP sensor, its connector and the wiring for damage, corrosion, loose pins or chafing.
  4. Inspect the vacuum hose and port to the MAP sensor (where fitted) for splits, blockages, kinks and a secure fit, and check for oil or fuel contamination.
  5. Check for vacuum leaks around the intake manifold, gaskets and other vacuum lines.
  6. Check the sensor's reference voltage, ground and signal at the connector with a multimeter, following the wiring diagram for the model and engine.
  7. Snap the throttle or apply vacuum to the sensor (if it is vacuum-fed) and watch whether the reading responds. If it does not, the sensor is suspect.
  8. Check the module's power and ground supplies only if the sensor and wiring test good.

How to fix

  • Replace the MAP sensor if it is stuck or reads out of range.
  • Clear, repair or replace blocked, split or disconnected vacuum hoses and ports to the sensor.
  • Repair or replace damaged wiring and connectors in the MAP sensor circuit.
  • Fix any vacuum leaks, such as manifold gaskets or perished lines.
  • Clear carbon or debris from the sensor port, then clear the code and road test to confirm it does not return.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but drivability and economy may be poor and the engine could stall or run lean or rich. Get it checked soon rather than leaving it.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

Nearby codes