Acura P1778: A/T Lockup Solenoid Valve 'C' Circuit Malfunction

Is your scanner showing Acura P1778?
No worries. We'll show you what it means and how to deal with it.

Presented by
Randy Worner

Acura P1778: A/T Lockup Solenoid Valve 'C' Circuit Malfunction

OVERVIEW
Severity
:
High
DIY Difficulty Level
:
Intermediate
Repair Cost
:
$150-$400
Can I Still Drive?
:
No

What Does The Acura P1778 Code Mean?

Vehicle driven in 1st, 2nd, 3rd and 4th gears, and the PCM detected an unexpected voltage condition on the Solenoid ‘C’ control circuit.

Note: The D4 lamp on the dash will blink when this code is set.

What Are The Potential Causes Of The Acura P1778 Code?

  • Lockup solenoid ‘C’ control circuit is open or shorted to ground
  • Lockup solenoid ‘C’ circuit is shorted to system power
  • Lockup solenoid ‘C’ is damaged or has failed
  • TCM or PCM has failed

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> Acura Engine Control Module

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

Acura P1778, DTCDECODE.

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