All Powertrain Transmission DTC Codes — Complete OBD-II Diagnostic Guide (2026)

This comprehensive reference covers every Powertrain Transmission diagnostic trouble code (DTC) — 16 codes total. Each code includes what triggers it, common symptoms, step-by-step diagnostic procedures, and repair guidance.

16DTC Codes

16Medium

Quick Reference — Powertrain Transmission Codes

DTC Code	Meaning	Severity	Common Makes
P0700	The P0700 code indicates a problem with the transmission control system, which manages the transmission's functions. This can cause issues with gear shifting, transmission slipping, or hard shifting.	medium	Toyota, Honda, Ford
P0715	The PCM detected an abnormal signal from the input/turbine speed sensor (often called the B‑sensor). When the sensor circuit is open, shorted, or out of range, the transmission cannot determine engine speed accurately, leading to shift problems.	medium	Toyota, Honda, Ford
P0720	The PCM (powertrain control module) has detected an abnormal signal from the output speed sensor, which tells the transmission how fast the output shaft is turning. When the signal is missing, out of range, or erratic, the PCM flags P0720 and may limit gear changes to protect the drivetrain.	medium	Toyota, Honda, Ford
P0730	P0730 signals an Incorrect Gear Ratio. The transmission control module (TCM) has compared the expected gear ratio (based on input and output speed sensors) with the actual ratio and found a mismatch.	medium	Toyota, Honda, Ford
P0732	The powertrain control module (PCM) has detected that the second‑gear ratio does not match the manufacturer’s target. This usually points to slip, a faulty shift solenoid, low or contaminated fluid, or internal wear in the second‑gear clutch pack.	medium	Toyota, Honda, Ford
P0734	The powertrain control module (PCM) has detected that the actual gear‑4 ratio differs from the expected value. This usually points to slip, a solenoid fault, clutch‑pack wear, or low‑quality fluid.	medium	Toyota, Honda, Ford
P0740	The powertrain control module (PCM) has detected an abnormal condition in the torque converter clutch (TCC) circuit. The clutch may not engage or disengage as commanded, leading to slip, harsh shifts, and reduced fuel efficiency.	medium	Toyota, Honda, Ford
P0741	The P0741 code signals a performance problem in the torque converter clutch (TCC) circuit. The powertrain control module (PCM) has detected an abnormal voltage or duty‑cycle signal from the TCC solenoid, indicating that the clutch is not engaging or disengaging as commanded.	medium	Toyota, Honda, Ford
P0746	P0746 indicates that the transmission’s pressure‑control solenoid is either not delivering the required hydraulic pressure or is stuck in the off position. The PCM detects this condition when the solenoid fails to open or close as commanded, which can cause hard shifting, slipping, or loss of gear engagement.	medium	Toyota, Honda, Ford
P0750	The powertrain control module (PCM) has detected an abnormal condition in Shift Solenoid A, which controls clutch engagement for specific gear changes. When the solenoid cannot open or close as commanded, the transmission may slip, hunt, or refuse to shift.	medium	Toyota, Honda, Ford
P0755	The Powertrain Control Module (PCM) has detected that Shift Solenoid B is not operating within its programmed parameters. This solenoid controls hydraulic pressure for the third gear (or the equivalent gear on a 4‑speed automatic) and a malfunction can cause hard shifting, missed shifts, or a failure to engage the gear at all.	medium	Toyota, Honda, Ford
P0868	The powertrain control module (PCM) has detected that the pressure inside the transmission is below the minimum threshold. This usually means fluid isn’t reaching the pump or a pressure‑control valve isn’t operating, which can cause slipping or missed shifts.	medium	Toyota, Honda, Ford
P1800	The P1800 code tells the powertrain control module that the CVT control valve circuit is out of spec. The valve controls hydraulic pressure that determines when the continuously variable transmission changes its gear ratio, so a fault can cause rough shifts, slipping, or a failure to engage gear.	medium	Toyota, Honda, Ford
SYMPTOM-HARD-SHIFTING	The SYMPTOM‑HARD‑SHIFTING code tells the powertrain control module that the transmission is experiencing excessive resistance or delay when changing gears. It usually appears when the shift feels rough, jerky, or when the vehicle lags before a gear engages.	medium	Toyota, Honda, Ford
SYMPTOM-SLIPPING-TRANS	When the powertrain control module records SYMPTOM-SLIPPING-TRANS, it means the transmission is not holding gear as commanded. The computer senses a mismatch between input and output speeds, indicating internal clutch wear, fluid issues, or sensor faults.	medium	Toyota, Honda, Ford
SYMPTOM‑WONT‑SHIFT	The SYMPTOM‑WONT‑SHIFT code tells the powertrain control module that the transmission refuses to shift out of the current gear. The PCM responds by entering limp mode to protect the drivetrain, limiting the vehicle to a single gear.	medium	Toyota, Honda, Ford

Detailed DTC Code Guides

P0700: The P0700 code indicates a problem with the transmission control system, which manages the transmission's functions. This can cause issues with gear shifting, transmission slipping, or hard shifting.

medium ⏱️ 30-60 minutes ⚠️ You can still drive with a P0700 code, but it's recommended to have it diagnosed and repaired as soon as possible to avoid potential transmission damage.

Learn to diagnose and fix OBD-II code P0700, a transmission control system malfunction. Get cost estimates, DIY steps, and find out if you can drive with...

Diagnostic steps:

Check for Obvious Issues
Scan for Additional Codes
Check Transmission Fluid Level
...see all 5 steps →

Detailed DTC Code Guides

Understanding Powertrain Transmission Codes

Tools You'll Need for Diagnosis

When to See a Mechanic