What Does P0783 Mean?
The TCM has detected an intermittent electrical fault in the Pressure Control Solenoid B circuit, or a 3-4 shift malfunction depending on the vehicle platform. The solenoid control signal is dropping out or fluctuating intermittently. This type of fault is typically caused by marginal connections that fail under vibration, temperature extremes, or specific operating conditions, making it more difficult to diagnose than a consistent failure.
Common Causes
30%
Intermittent PCS B solenoid coil failure (thermal or vibration sensitive)
30%
Loose or corroded connector pins causing intermittent contact loss
20%
Partially broken or chafed wire in the transmission harness
12%
TCM connector with marginal pin tension
8%
TCM driver circuit intermittent failure
Diagnostic Steps
1
Analyze freeze frame data to determine the conditions (RPM, speed, temperature, gear) when the intermittent fault was detected.
2
Inspect all connectors in the PCS B circuit for corrosion, moisture damage, pushed-back pins, and proper terminal retention force.
3
Measure solenoid resistance at room temperature and again at operating temperature — some coil failures only appear when hot.
4
Perform a detailed wiggle test of the entire harness from TCM to transmission while monitoring the PCS B circuit for signal dropouts.
5
Check for TSBs addressing known harness routing or connector issues for the specific vehicle.
6
If external inspection reveals no fault, replace PCS B as intermittent coil failures are a common and difficult-to-catch root cause.
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The TCM has detected an intermittent electrical fault in the Pressure Control Solenoid B circuit, or a 3-4 shift malfunction depending on the vehicle platform. The solenoid control signal is dropping out or fluctuating intermittently. This type of fault is typically caused by marginal connections th...
The most common cause of P0783 (Pressure Control Solenoid B Intermittent) is: Intermittent PCS B solenoid coil failure (thermal or vibration sensitive)
Typical repair costs for P0783 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent pressure control faults can cause unpredictable shift behavior — occasional harsh shifts, brief slipping, or momentary limp mode. While drivable, the unpredictable nature warrants timely diagnosis to prevent more serious transmission issues.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0783 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
