How is fault code P0780 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Pull all the stored codes, not just P0780. Look for companion codes like P0770 through P0774, P0781 to P0783 or P0740, because they tell you whether the whole solenoid pack is unhappy or just this one circuit 2. Check the fluid level and condition while the engine is warm. Low level, dark brown colour or a burnt smell points you straight at a service before you spend a penny on parts 3. Inspect the wiring loom and the main gearbox connector for chafing, corrosion and heat damage where it runs near the exhaust. A green crusty pin can mimic a dead solenoid 4. Use a capable scan tool to command the solenoids and watch live data. If solenoid E won't respond or its resistance reads outside spec, you've found it 5. Put a manual gauge on the line pressure if the fluid and electrics check out. Low or wandering pressure means the pump or valve body is the real fault, not the solenoid 6. If the electrics and pressure look fine, check for an available TCM software update on makes known for it befo

Pressure Control Solenoid B Performance

Jump to the fix

Severity

High

Can I keep driving?

Avoid extended driving; visit a service soon.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Pull all the stored codes, not just P0780. Look for companion codes like P0770 through P0774, P0781 to P0783 or P0740, because they tell you whether the whole solenoid pack is unhappy or just this one circuit 2. Check the fluid level and condition while the engine is warm.

PPowertrain
0Generic code
7Transmission
80Sequence number

What does it mean?

DTC P0780: The TCM (Transmission Control Module) or PCM (powertrain control module) monitors the transmission mechanical shifting through various sensors. This malfunction is detected when the transmission does not shift as instructed by the TCM. This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc.

NOTE: Whenever diagnosing a 700 series DTC (Diagnostic Trouble Code) with a transmission, transfer case or other driveline components, check for a DTC under chassis and body systems, not just under “P” or powertrain/engine or emission control type codes. Module communications DTCs are “U” codes. These are most often found when looking for DTCs under chassis or body systems.

Chassis related codes are labeled “C” and body system related codes are labeled “B” codes and these can cause drivetrain issues if they affect a sensor that is also used by the heating and air conditioning system. The TCM or PCM has detected an abnormality in shift procedure. The TCM/PCM controlled automatic transmission uses shift solenoids to manage the transfer of fluid between hydraulic circuits and actuate a change in transmission gear ratio.

Varying gear ratios are needed to increase and decrease vehicle speed, maximize engine performance, and optimize fuel efficiency.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

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This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.