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Harsh or slipping shifts: Codes, Causes & Fixes

Harsh, delayed or slipping shifts in an automatic transmission often trace back to low or degraded fluid, a faulty shift or pressure control solenoid, a speed sensor problem or adaptive shift values that need relearning. Related codes sit mainly in the P07xx range, such as P0700 (transmission control system fault requested) and gear ratio codes P0730–P0736. Avoid heavy loads and long drives until the cause is known, because slipping quickly wears clutches and bands.

80Codes
3.1Average severity
23%High or critical
5%DIY-friendly
Severity distributionSeverity distribution

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P0700 Powertrain The transmission computer found a fault and asked for the check engine light – read the TCM… Moderate P0741 Powertrain The torque converter lockup clutch slips or won't engage when the computer commands it. Moderate U0073 Network A module saw so many errors on CAN bus A that it shut off its own transmitter. High U0100 Network Another module stopped hearing from the engine computer on the CAN network. High U0121 Network Other modules stopped receiving data from the ABS module, so ABS and stability control are off. Moderate P0105 Powertrain The PCM lost a usable signal from the manifold pressure sensor: dropouts, noise or values it… Moderate

All codes (80)

All Severity 3+ Severity 4+
P1698 Jeep · Powertrain The engine computer stopped hearing from the transmission computer, often leaving the Jeep… Moderate P1702 Ford · Powertrain Ford's gear selector position signal drops out now and then, so the PCM briefly loses track… Moderate P1735 Volkswagen · Powertrain The DSG control unit lost a valid signal from the sensor that tracks clutch 1 and locks out… High P175D Volkswagen · Powertrain The DSG computer saw clutch 1 let go while it was supposed to stay engaged, so it cut… High P1778 Nissan · Powertrain The Jatco CVT's step motor is being commanded, but the pulley ratio isn't following it as it… High P17F0 Nissan · Powertrain The TCM detected judder it blames on the CVT itself, usually belt or pulley slip inside… High P17F1 Nissan · Powertrain The TCM caught a judder event it links to the CVT's control valve (valve body), not yet to belt… Moderate P2714 Powertrain Transmission pressure solenoid D isn't regulating pressure as commanded – a classic source… Moderate P2716 Powertrain The transmission computer sees an open or short in the circuit of pressure control solenoid D. Moderate U0001 Network A module found the high-speed CAN network itself misbehaving, not just one silent module. High U0073 Network A module saw so many errors on CAN bus A that it shut off its own transmitter. High U0100 Network Another module stopped hearing from the engine computer on the CAN network. High U0101 Network The engine computer and other modules stopped hearing from the transmission control module. High U0102 Network Other modules can't hear the 4WD transfer case module, so 4WD shifting is disabled. Moderate U0103 Network The electronic shifter (dial, knob or joystick) stopped talking to the transmission and engine… High U0121 Network Other modules stopped receiving data from the ABS module, so ABS and stability control are off. Moderate U0401 Network The engine computer is still on the network, but another module doesn't trust the numbers it's… Moderate U0402 Network The transmission module is online, but the gear, range or torque data it sends doesn't add up. Moderate U0404 Network The electronic shifter reports a lever position the transmission can't trust, so Park may not… High U0415 Network The ABS module is online, but the wheel-speed data it shares looks wrong to the other modules. Moderate

Symptoms

Check engine light on 558Loss of power 214Rough idle 184Limp mode 165Poor fuel economy 146Engine stalling 133Car won't start 123ABS / traction light on 65Fuel smell 34Check engine light flashing 22