P1001 - FAULT CODE - OBD2

P1001 Code failures by brands

P1001 FORD, LINCOLN, MERCURY: KEY ON/ENGINE RUNNING NOT ABLE TO COMPLETE

P1001 CHRYSLER, DODGE, JEEP: IGNITION KEY OFF TIMER PERFORMANCE TOO FAST.

P1001 MAZDA: DATA LINK CONNECTOR MALFUNCTION

Description of DTC code P1001

The DTC P1001 OBDII code is a manufacturer-specific code that is set when the Engine Electronic Module (EEC) is unable to complete a series of diagnostic self-tests known as KOER (Key-On-Engine-Running) tests. The function of these tests is to check the operation and system status of the various sensors, controllers, control circuits, and monitoring and feedback systems of these components.

If the required tests cannot be performed within a period already established by the manufacturer, this code will be set. Take into account this period depends largely on the vehicle model and the specific architecture of the ECC module.

Symptoms of fault code P1001

The Check Engine lamp lights up.

Causes of OBD2 P1001

The reasons for setting the fault code P1001 OBD2 are:

Cables, connectors, fuses, or relays may be in poor condition.
Vacuum lines may be worn or damaged.
A position sensor or switch may be defective.
The EEC Module may be damaged. In this case, specific codes would be set for this malfunction.

Possible solutions of the DTC code P1001

To solve the problems related to the diagnostic code P1001 OBDII, you should do the following:

Check the TSB (Technical Service Bulletins) and verify that no other DTC codes are stored. If this is the case, diagnose these codes first.
Refer to the service manual for the diagnostic procedure steps for the EEC You should check the proper operation of these.
Check all wiring and connectors for common damage. If they are in good condition, you should test for resistance, continuity, and ground integrity. These results should match the values given in the specifications. Repair as necessary.