P1224

What it means

On Jaguar, P1224 means the engine control module has detected an Electronic Throttle Control position error. The commanded throttle angle and the angle reported by the throttle position sensors do not agree within the expected limits, or the throttle is not moving as requested. The module will usually limit engine power to protect the engine and keep the car safe.

Symptoms

• Engine warning light on, possibly with a throttle or reduced power message
• Limp-home mode with restricted power and poor acceleration
• Hesitation or unresponsive accelerator pedal
• Rough, high or unstable idle, or stalling
• Engine slow to rev or surging when pulling away

Possible causes

• Dirty or carbon-fouled throttle body causing the plate to stick or move slowlylikely
• Faulty throttle body motor or internal throttle position sensorslikely
• Wiring or connector fault in the throttle body circuit, such as corrosion, chafing or poor pin tensionpossible
• Unmetered air from an intake leak upsetting throttle controlpossible
• Low or unstable supply voltage from a weak battery or charging faultpossible
• Accelerator pedal position sensor fault giving a conflicting demand signalpossible
• Engine control module fault or outdated software calibration, which varies by model and enginerare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting engine speed, load and throttle angle when the fault set
2. Check the battery condition and charging voltage, and fix any low-voltage issue before going further
3. Inspect the throttle body and its wiring and connector for damage, corrosion, oil or water ingress
4. Look at the throttle plate for carbon build-up or sticking, and check it moves smoothly by hand with the ignition off where the design allows
5. Check the intake pipework and hoses for splits, loose clamps and vacuum leaks
6. With a scan tool, compare commanded and actual throttle angle and the pedal sensor readings while moving the pedal slowly through its range
7. Check the supply, reference voltage and ground at the throttle body connector against the model's wiring data
8. Check for relevant software updates or technical bulletins for the specific model and engine

How to fix

• Clean the throttle body using a method suitable for electronic throttles, then perform the throttle adaptation or relearn procedure for that model
• Replace the throttle body if the motor or position sensors are faulty, then carry out the adaptation procedure
• Repair or replace damaged wiring and connectors in the throttle circuit
• Repair any intake leaks by replacing split hoses or faulty seals
• Replace the accelerator pedal assembly if its sensor signals are implausible
• Update the control module software only where an outdated calibration is confirmed as a cause for that model

Can I keep driving?

This code for other makes

• P1224FordThrottle Position Sensor B Out of Self-Test Range
• P1224LincolnThrottle Position Sensor B Out of Self-Test Range
• P1224MercuryThrottle Position Sensor B Out of Self-Test Range
• P1224OtherThrottle Position Sensor B Out Of Self Test Range

Nearby codes

• P1221JaguarPedal Demand Sensor B Circuit Range Performance
• P1226JaguarMechanical Guard Circuit Range Performance