Failed intercooler pump motor, often due to worn brushes or seized bearings; Open or shorted wiring in the intercooler pump circuit, including damaged connectors or chafed harness; Blown fuse or faulty relay that supplies power to the intercooler pump; Corroded or loose electrical connectors at the pump or PCM; Faulty powertrain control module (PCM) driver circuit, though rare; Restricted coolant flow or air lock causing the pump to overheat and draw excessive current

DTC codes / Ford codes / P1229

P1229 · FordIntercooler Pump Driver Fault

Q: What does code P1229 mean?

Intercooler Pump Driver Fault. P1229 on Ford vehicles indicates that the powertrain control module (PCM) has detected a fault in the intercooler pump driver circuit, which is responsible for operating the pump that circulates coolant through the intercooler system. The PCM monitors the driver output for expected voltage or current feedback and sets this code when the signal is outside the expected range, often due to an open, short, or excessive current draw.

P1229 on Ford vehicles indicates that the powertrain control module (PCM) has detected a fault in the intercooler pump driver circuit, which is responsible for operating the pump that circulates coolant through the intercooler system. The PCM monitors the driver output for expected voltage or current feedback and sets this code when the signal is outside the expected range, often due to an open, short, or excessive current draw.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine power or limp mode during heavy acceleration or towing
Higher than normal intake air temperatures, which may cause pinging or power loss
The intercooler pump may not run at all, leading to heat soak after the engine is shut off
In some cases, the engine may run rough or hesitate under boost

Common causes, most likely first

Failed intercooler pump motor, often due to worn brushes or seized bearings
Open or shorted wiring in the intercooler pump circuit, including damaged connectors or chafed harness
Blown fuse or faulty relay that supplies power to the intercooler pump
Corroded or loose electrical connectors at the pump or PCM
Faulty powertrain control module (PCM) driver circuit, though rare
Restricted coolant flow or air lock causing the pump to overheat and draw excessive current

How to diagnose and fix it

Check the intercooler pump fuse and relay, and replace if blown or faulty
Inspect the wiring harness and connectors at the pump and PCM for damage, corrosion, or loose pins
Test the intercooler pump by applying 12 volts directly to confirm it operates; replace if it does not
Measure resistance and voltage drop across the pump circuit to identify excessive resistance or shorts
Use a scan tool to command the intercooler pump on and verify operation and current draw
If the pump and wiring are good, test the PCM driver output with a lab scope or substitute a known-good PCM
Clear the code and road test to verify the repair, monitoring intake air temperature and pump operation

Before you replace the intercooler pump

A common misdiagnosis is replacing the intercooler pump when the actual fault is a corroded connector or chafed wire that intermittently shorts to ground.
The intercooler pump may only run under certain conditions, such as when intake air temperature exceeds a threshold, so a static test may not reveal a fault.
On some Ford models, the intercooler pump is controlled by the PCM through a relay, and a failing relay can mimic a pump failure.
Air trapped in the intercooler system after coolant service can cause the pump to cavitate and draw high current, setting this code without a defective pump.
This code does not always mean the pump is dead; it can also set if the pump circuit has excessive current draw due to a failing motor or restricted coolant flow.

Can I keep driving with P1229?

You can usually drive the vehicle with this code, but avoid heavy acceleration or towing to prevent overheating of the intake charge, which can lead to reduced power and potential engine damage. If the check engine light is flashing or you experience severe power loss, stop driving and seek service immediately.

Tools that help

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Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.