Low, degraded or contaminated transmission fluid; Worn or burnt friction element H clutch or brake plates; Faulty or sticking shift or pressure control solenoid feeding element H; Valve body wear, blocked passages or internal hydraulic pressure leaks; Wiring or connector fault in the solenoid circuit or speed sensor circuits; Faulty input or output speed sensor giving false slip readings; Outdated transmission control unit software or a internal control unit fault.

P07B0

Transmission Friction Element H Performance/Stuck Off.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
7: AreaTransmission
B0: FaultThe specific fault in that area

What it means

P07B0 is a generic powertrain code meaning the transmission control unit has detected that friction element H, a clutch or brake pack inside the automatic gearbox, is not engaging when commanded (performance or stuck off). The control unit usually sets it when it sees input and output shaft speeds that do not match the expected ratio for the selected gear, indicating slip or no drive through that element. Which gears use element H, and where it sits, depends on the specific gearbox design.

Symptoms

Engine flare or revs rising without matching acceleration during a gear change
Harsh, delayed or missing engagement of one or more gears
Transmission stuck in a limp-home gear
Gearbox warning light or malfunction indicator lamp on
Slipping under load or when pulling away
Reduced performance and poor fuel economy

Possible causes

Low, degraded or contaminated transmission fluidlikely
Worn or burnt friction element H clutch or brake plateslikely
Faulty or sticking shift or pressure control solenoid feeding element Hlikely
Valve body wear, blocked passages or internal hydraulic pressure leakspossible
Wiring or connector fault in the solenoid circuit or speed sensor circuitspossible
Faulty input or output speed sensor giving false slip readingspossible
Outdated transmission control unit software or a internal control unit faultrare

How to diagnose

Read all stored codes and freeze frame data, noting gear, temperature, load and speeds when the fault set
Check for related codes such as solenoid, speed sensor or ratio codes, and check for any known software updates for the vehicle
Check the transmission fluid level and condition (colour, smell, debris) using the manufacturer's procedure and temperature
Inspect the wiring, connectors and transmission harness for damage, corrosion, fluid ingress or chafing
Use live data to compare input and output speeds and commanded against actual gear, and check the speed sensor signals
Test the solenoid circuit resistance and operation against the manufacturer's specification
Check line pressure and clutch apply pressures where the gearbox design allows
Inspect the valve body and friction element H components if the gearbox needs to be dismantled

How to fix

Correct the fluid level or replace degraded fluid and filter as per the manufacturer's specification
Repair or replace damaged wiring, connectors or the transmission harness
Replace a faulty solenoid or speed sensor once testing confirms it
Clean, repair or replace the valve body if worn or blocked
Overhaul or replace the gearbox with new friction element H plates and seals if worn or burnt
Update the transmission control unit software if an outdated calibration is a known cause for that model

Can I keep driving?

High severity

Limit driving, as continued slipping can quickly burn the clutch plates and cause costly internal damage. Avoid heavy loads and long journeys, and have the gearbox diagnosed promptly, particularly if it has gone into limp mode.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.