P1297 Code: No Change in MAP Sensor When Switching From A/C to Full Throttle

🟢 Low severity · drivable

The car will usually drive fine, but it may stall when the A/C kicks on, so get it checked when convenient.

What P1297 means

Turning on the A/C or pressing the gas to full throttle should change the vacuum the MAP sensor reads. P1297 means the MAP reading never changed when it should, which tells the computer the sensor may be stuck or there's a vacuum problem. This code is most often seen on Chrysler, Dodge, and Jeep vehicles.

Symptoms

Check engine light is on
Stalling when the A/C is turned on
Hesitation under full throttle
Rough idle

Common causes

most common: MAP sensor stuck or reading incorrectly
common: Vacuum leak or blocked MAP sensor vacuum line
less common: Wiring problem in the MAP sensor circuit
less common: A/C system load problem, such as a faulty compressor clutch

How to fix it

Fix	DIY?	Typical cost
Test and replace a faulty MAP sensor	Yes	$40–120
Check and repair the MAP sensor vacuum line	Yes	$10–50
Inspect the A/C system for a clutch or load problem	Mechanic	$100–400

Frequently asked questions

Can I drive with a P1297 code?

Yes, usually. The car may stall when the A/C kicks on or hesitate at full throttle, but it's generally safe to drive short distances.

Why does the MAP sensor need to change when the A/C turns on?

The A/C adds load to the engine, which changes intake vacuum. The computer expects the MAP reading to shift and uses that to adjust the fuel mix; if it doesn't change, it stores P1297.

How much does it cost to fix P1297?

If the MAP sensor is bad, about $40–$120. A vacuum line fix can be under $50, while an A/C problem could cost more.

Related codes

P0106

P0106 Code: Manifold Absolute Pressure Sensor Range/Performance

P0107

P0107 Code: Manifold Absolute Pressure Sensor Circuit Low

P0108

P0108 Code: Manifold Absolute Pressure Sensor Circuit High

Updated 2026-08. This page is informational and not a substitute for professional diagnosis.