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Powertrain

P1378

Code meaning and manufacturer information

OBD-II / DTC

Reference meaning

What does this code mean?

The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.

A code identifies a detected condition, not a part that must automatically be replaced.

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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

Before replacing a part

Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.

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Manufacturer wording

Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.

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Manufacturer communications

2

Original wording in English

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LEXUS

TSB: Some 2015 ? 2017 model year NX 200t and 2016 ? 2017 model year GS 200t, IS 200t, and RC 200t vehicles equipped with an 8AR-FTS engine may exhibit a MIL ?ON? condition with Diagnostic Trouble Code (DTC) P137800 (Pre-ignition Detected) followed by a ?Reduced Engine Power Visit Your Dealer? message on the Multi-Informational D…

TSB-08-26-3 ↗

FORD

FORD: SOME VEHICLES WITH DIESEL ENGINES MAY EXPERIENCE NO STARTS, HARD STARTS OR ROUGH RUNNING WHEN COLD AND MAY BE ACCOMPANIED WITH DIAGNOSTIC TROUBLE CODES (DTCS) P0611, P1378 AND/OR ALL 8 INJECTOR CIRCUIT CODES. *PE

Check vehicle applicability

33

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

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MakeModelModel year
FordE-350 ↗2009
FordE-350 ↗2008
FordE-350 ↗2007
FordE-350 ↗2006
FordE-350 ↗2005
FordE-350 ↗2004
FordE-450 ↗2009
FordE-450 ↗2008

Can I keep driving?

A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.