Diagnostic help: Volvo fault code P0070 – Pump Motor Relay Incorrect

ATE MK20

ABS-units

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When reading the ABS ECU of a Volvo from the turn of the century, the fault code P0070 may appear with the description “Pump Motor Relay Incorrect” and often refers to a problem with the ATE MK20.

What does error code P0070 mean?

Error code P0070 indicates a problem with the pump motor relay in the ABS system. This relay plays a crucial role in activating the ABS pump when necessary. When the ABS ECU (in this case often the ATE MK20) detects an incorrect signal or a malfunction in the operation of the relay, this error code is stored. This can lead to a non-functioning ABS system, with possible consequences for the braking performance of the car. A fault in the pump motor relay can therefore be accompanied by the following symptoms:

The ABS warning light is illuminated on the dashboard
The ABS system does is not functioning correctly, or at all
The wheels can lock during braking, especially in the event of an emergency stop

Which Volvo models have error code P0070?

This error code is often seen in the following Volvo models:

Volvo 850 (1991 – 1997)
Volvo C70 (1997 – 2005)
Volvo S60 (2000 – 2009)
Volvo S70 (1996 – 2000)
Volvo S80 (1998 – 2016)
Volvo V70 (1996 – 2007)
Volvo XC70 (1997 – 2007)

Causes of error code P0070

There are several causes that can explain error code P0070:

Faulty pump motor relay: The relay itself can be damaged or worn internally.
Wiring problems: Damaged or corroded wiring to the relay or the ABS ECU can disrupt communication.
Faulty ABS ECU: The ATE MK20 may have an internal error, which means the relay is not controlled correctly.
Problem with the ABS pump: In rare cases, a mechanical defect in the ABS pump can cause the problem.

Note: the ATE MK20 often suffers from poor connections or damaged wiring. Therefore, first check all connections before sending the ABS ECU for revision.

Solution for the P0070 fault code

There are multiple reasons the P0070 fault code can be triggered. With some careful diagnosis, the root cause can be easily identified and resolved. Is the ABS ECU or ABS pump faulty? Then a remanufacture of the ATE MK20 is the solution. Do you have any questions about having the ATE MK20 repaired? Then our business technical helpdesk is happy to help you.