Error code

OBD2 P0748

OBD2P0748
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Pressure Control Solenoid 'A' Electrical.

Severity

moderateCan be driven, but performance issues and potential damage to the transmission may occur.

Summary

P0748 indicates an electrical issue with the transmission fluid pressure solenoid 'A'. This code is related to problems in the wiring or the solenoid itself within the transmission.

Symptoms

  • Stored trouble code and possibly an illuminated warning light
  • Varying degrees of transmission slippage
  • Transmission overheating
  • Transmission stuck in one gear or not engaging some gears
  • Misfire-like symptoms at certain engine speeds
  • Increased fuel consumption

Common Causes

  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or connectors
  • Degraded transmission fluid
  • Defective pressure control solenoid 'A'
  • Defective transmission valve body or clogged fluid passages in the valve body
  • Mechanical failure of the transmission pressure pump

Diagnosis

  1. Record all fault codes and freeze frame data.
  2. Check and adjust transmission fluid level; replace if degraded.
  3. Inspect wiring harness for damage or corrosion.
  4. Perform resistance, continuity, and ground integrity checks on associated wiring.
  5. Refer to a professional mechanic if the issue persists.

Fixes

  • Replace damaged wiring or connectors
  • Replace degraded transmission fluid and filter
  • Replace defective pressure control solenoid 'A'

FAQ

What should I do if the code persists after basic checks?

Refer to a professional mechanic for further diagnosis and repair.

Can I drive with P0748?

You can drive, but performance issues may occur and there is potential risk of transmission damage.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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