P00C7
Intake Air Pressure Measurement System - Multiple Sensor Correlation Bank 1.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 0
- AreaFuel and air metering, auxiliary emission controls
- C7
- FaultThe specific fault in that area
What it means
P00C7 means the engine control unit has compared two or more intake air pressure readings on bank 1 (for example manifold pressure, boost pressure or throttle inlet pressure) and found they do not agree as expected. The disagreement was large enough, or lasted long enough, to set the fault. Which sensors are compared depends on the make, model and engine, so check the vehicle-specific layout before replacing anything.
Symptoms
- Engine warning light on
- Reduced power or the car going into limp mode
- Poor or hesitant acceleration, especially under load
- Rough idle or occasional stalling
- Boost or turbo-related fault messages on turbocharged engines
- Poor fuel economy
Possible causes
- Faulty or drifting intake pressure sensor (manifold, boost or throttle inlet) giving an inaccurate readinglikely
- Air leak, split hose or loose clamp in the intake or charge-air pipework affecting one sensor more than the otherlikely
- Wiring or connector fault on a sensor circuit, such as corrosion, chafing, high resistance or poor reference supply or earthpossible
- Blocked or leaking sensor port or pressure pipe, for example oil or carbon contaminationpossible
- Restricted air filter or intake, or a boost control fault such as a turbo, wastegate or actuator problem, causing real pressure to differ from what is expectedpossible
- Control unit fault or outdated software calibration, where the manufacturer has identified one as a cause for this enginerare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting load, engine speed and boost at the time the fault set, and look for other pressure sensor or boost codes.
- Visually inspect the intake and charge-air pipes, hoses, clamps, intercooler connections and air filter for splits, oil, looseness or blockage.
- Inspect the connectors and wiring of each intake pressure sensor involved for damage, corrosion, water ingress and bent or loose pins.
- With the engine off and key on, compare live data from each pressure sensor against barometric pressure; they should read similar values.
- Compare the sensor readings at idle and under load, and note which one deviates from the others or from the expected value for the engine.
- Check each sensor's reference voltage, earth and signal circuit against the manufacturer's specification.
- Smoke test or pressure test the intake and charge-air system to find leaks, and check the sensor ports and pipes are clear.
- Check for relevant technical service bulletins or software updates for the model and engine before condemning the control unit.
How to fix
- Replace the intake pressure sensor that is proven faulty or out of range.
- Repair or replace leaking, split or loose intake and charge-air hoses, clamps and connections.
- Repair damaged wiring or connectors, and clean or restore poor terminals and earths.
- Clean or replace blocked sensor ports and pressure pipes, and fit a new air filter if restricted.
- Repair the boost control or turbo system fault if it is the cause of real pressure differences.
- Apply a manufacturer-approved software update only if an outdated or faulty calibration is confirmed as the cause.
Can I keep driving?
The car can usually be driven carefully for a short time, but power may be limited and the fault could get worse or cause poor running. Get it checked soon, and avoid heavy loads or hard acceleration until it is fixed.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.