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

ATE MK20

ABS-units

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If you scan the ECU of a turn-of-the-century Volvo, chances are you may be presented with a P0070 Fault Code. This "Pump Motor Relay Incorrect" fault often refers to problems with the ABS unit, the ATE MK20.

What does the P0070 fault code mean?

P0070 fault codes indicate a problem with the pump motor relay in the ABS. Responsible for the crucial role of activating the ABS pump, the pump motor relay failure results in non-functioning ABS! 

When the ABS ECU detects an incorrect signal or malfunction with the pump motor relay, this error code is stored, resulting in a severe reduction in braking performance. The symptoms associated with this fault include: 

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

Which Volvo models commonly see the 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 P0070 fault code:

Several causes can explain the P0070 fault code:

• 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, check all connections before sending the ABS ECU for remanufacturing.

Solution for the P0070 fault code

There are several causes for the P0070 fault code being stored. With some careful diagnosis, the root cause can be quickly identified and resolved. Is the ABS ECU or ABS pump faulty? Then the remanufacture of the ATE MK20 is the answer. Backed by a 2-year warranty, ACTRONICS' cost-effective alternative to a new placement is the answer. 

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