P CODE FAMILY

Powertrain code references — Page 60.

Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.

Ford / Lincoln +1

P1728

These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

Transmission Slip Error

Different Wheel Speed Signals Range Performance

Ford does not see the expected low-range switch state

Transmission 4x4 Low Switch Error

Starter Interlock Circuit Short To B+

Jaguar 5 HP 24 gear-control fault after a ratio warning

1994 Mustang misses the expected 1–2 shift rpm drop

Inconsistent Gear Ratio

1994 Mustang 2–3 shift lacks its expected rpm change

1994 Mustang 3–4 shift result does not match the command

Tiptronic Switch Down Circuit Short To Ground

Pressure Control Solenoid B Electrical

Jaguar fifth-gear control failure and fourth-gear fallback

First Gear Switch Circuit Failure

Second Gear Switch Circuit Failure

Lockup Solenoid

Pressure Control Solenoid C Electrical

Honda second clutch pressure switch circuit diagnosis

Shift Time Error

Honda third clutch pressure switch feedback checks

Slip Solenoid

Tiptronic Switch Up Circuit Short To Ground

Transmission Torque Reduction Request Circuit

TCC Or OD Solenoid Performance

Torque Converter Clutch Solenoid Mechanical Fault

Torque Converter Clutch Control Error

Torque Converter Clutch Control Electrical Fault

Clutch Pressure Adaptation At Limit

Ford torque-converter clutch appears stuck on

Torque Converter Clutch Solenoid Shorted

Auto Trans Diagnosis Input Signal Malfunction

Clutch Torque Adaptation At Limit

A transmission pressure-control valve electrical fault

TP Signal From ECM

Torque Converter Clutch Solenoid Faulty

Torque Converter Clutch Solenoid Valve Open Or Short

Torque Converter Clutch Failed On TCIL Is On

Clutch Slip Control Signal Too High

Pressure Control Solenoid A Electrical

Ford torque-converter clutch fails its functional slip check

Torque Converter Clutch Solenoid Mechanical Fault

Tiptronic Switch Recognition Circuit Short To Ground

Jaguar 5 HP 24 pressure-regulator-one electrical fault

Line Pressure Solenoid

Transmission Control Unit Relay Short To B+

Transmission Control Module Output Stage

Electronic Pressure Control Solenoid A Open Circuit

Pressure Regulator 2

Electronic Pressure Control Solenoid Circuit Open

Volkswagen transmission relay fault and low voltage at J743

CAN Bus Monitoring

Ford electronic pressure-control current is below command

Pressure Regulator 3

Electronic Pressure Control Solenoid Circuit

Transmission Control Unit Relay Open Short To Ground

Transmission Control Module Self Test

EPC Malfunction

Jaguar 5 HP 24 pressure-regulator-five circuit fault

Pressure Control Solenoid A

Transmission Control Unit Self-Check

Secondary Pressure Solenoid Communication Error

Electronic Pressure Control Solenoid Failed Low

Electronic Pressure Control Solenoid Circuit Low

The transmission controller recognizes incorrect coding

Secondary Pressure Solenoid Circuit Range Performance

Solenoid Assembly

Transmission supply voltage is outside the usable range

Secondary Pressure Solenoid Open Circuit

1994 Mustang California shift-solenoid 1 functional failure

Transmission Shift Solenoid A Mechanical Fault

A/T Control Relay

Power Supply Voltage High

Transmission Shift Solenoid A Circuit Shorted

Transmission supply voltage fluctuates excessively

Coast Clutch Solenoid Circuit Malfunction

Transmission Coast Clutch Solenoid Electrical Fault

1994 Mustang California shift-solenoid 2 functional failure

Governor Pressure Not Equal To Target At 15 20 PSI

Transmission Shift Solenoid B Mechanical Fault

distinguish real governor pressure from a false Jeep reading