B1342 - ECU Is Defective

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3

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Possible causes

The B1342 code means that the Electronic Control Unit (ECU) has failed, usually the code is combine with other issues or codes. Repair other problems before replacing the ECU

What does this mean?

Possible symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B1342 Information for specific makes

B1342 FORD ECU Is Defective

B1342 LINCOLN ECU Is Defective

B1342 MERCURY ECU Is Defective

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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