Faulty throttle position sensor B or throttle body assembly (sensor is usually built into the electronic throttle body); Wiring or connector fault on the sensor B signal, reference voltage or ground circuit (corrosion, chafing, high resistance, short or open circuit); Carbon build-up or a sticking throttle plate causing implausible readings; Low battery voltage or poor engine or control unit earth connections affecting sensor signals; Throttle body adaptation or relearn not completed after cleaning, replacement or battery disconnection; Faulty engine control unit.

P1224

Throttle Position Sensor B Out Of Self Test Range.

Other
Powertrain
Manufacturer code
Medium severity

How this code is built

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

What it means

P1224 is a manufacturer-specific code. On the makes that use it with this meaning, it indicates that throttle position sensor B read outside its expected range during the engine control unit's self-test or normal plausibility checking. The control unit compared the sensor B signal with the expected value or with sensor A and found a mismatch. The meaning differs between makes, and Jaguar uses it for a throttle control position error, so confirm the definition for the exact vehicle.

Symptoms

Engine warning light on
Reduced power or limp-home mode with restricted throttle response
Hesitation or poor throttle response when pulling away
Unstable, high or low idle speed
Engine may stall or fail to rev freely
Failed self-test or readiness check

Possible causes

Faulty throttle position sensor B or throttle body assembly (sensor is usually built into the electronic throttle body)likely
Wiring or connector fault on the sensor B signal, reference voltage or ground circuit (corrosion, chafing, high resistance, short or open circuit)likely
Carbon build-up or a sticking throttle plate causing implausible readingspossible
Low battery voltage or poor engine or control unit earth connections affecting sensor signalspossible
Throttle body adaptation or relearn not completed after cleaning, replacement or battery disconnectionpossible
Faulty engine control unitrare

How to diagnose

Read all stored and pending codes and note freeze frame data, as other throttle or pedal sensor codes help narrow the cause.
Check battery condition and charging voltage, and inspect the main earth connections.
Visually inspect the throttle body connector and wiring for damage, corrosion, loose pins, or chafing.
Check the throttle body for heavy carbon build-up and free movement of the plate, following the manufacturer's procedure for electronic throttles.
With a scan tool, view live data for throttle sensors A and B and check they move smoothly and track each other as the pedal is pressed.
Check the reference voltage and ground at the sensor connector, then test the signal wire for continuity and shorts to power or earth.
Consult model-specific service information for the correct self-test procedure and expected sensor voltage ranges, as these vary by make and engine.
Clear the code and retest, checking whether it returns immediately or only under certain conditions.

How to fix

Repair or replace damaged wiring, terminals or connectors on the sensor B circuit.
Clean the throttle body using the approved method, then carry out the throttle adaptation or relearn procedure.
Replace the throttle body assembly if sensor B is faulty or the readings remain implausible, then complete any required relearn.
Correct low battery voltage or poor earth connections.
Consider the engine control unit only after all wiring, power, ground and throttle body faults have been ruled out.

Can I keep driving?

Medium severity

The car may enter limp mode with reduced power and unpredictable throttle response, which can be unsafe in traffic. Drive it cautiously only as far as necessary and have it repaired soon.

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