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Home / DTC / P0761 — Shift Solenoid C Performance or Stuck Off

P0761 — Shift Solenoid C Performance or Stuck Off

Detailed page for trouble code P0761.

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Code

P0761

MERCEDES-BENZ P — Powertrain

Shift Solenoid C Performance or Stuck Off

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed shift solenoid C (mechanical seizure or electrical failure)
  • Open, short, or high resistance in solenoid wiring or connectors
  • Corroded/loose connector or poor ground
  • Contaminated or clogged valve body or hydraulic passages
  • Low, dirty, or incorrect transmission fluid
  • Faulty TCM or wiring to TCM

Symptoms

  • Transmission warning lamp or check engine lamp illuminated
  • Harsh, delayed, or failed gear changes
  • Transmission stuck in limp/reduced-gear mode (reduced gear range)
  • Erratic shifting or inability to engage certain gears
  • Unusual transmission noises during shifting
  • Reduced vehicle acceleration or drivability issues

What to check

  • Read and record freeze frame data and all related transmission codes with an OEM-capable scanner
  • Check transmission fluid level, condition and temperature (correct level and clean fluid required)
  • Visually inspect solenoid C connector for corrosion, bent pins, or contamination
  • Back-probe solenoid connector while commanding solenoid with scan tool; observe voltage/duty cycle/current
  • Measure solenoid coil resistance and compare to specification
  • Check for continuity between solenoid connector and TCM connector, and for shorts to ground/battery

Signal parameters

  • Typical static coil resistance: varies by model — commonly in the range ~10–40 ohms (refer to OEM spec)
  • Command signal: PWM with variable duty cycle (0–100%); voltage typically switches between ~0–12V depending on system
  • Command frequency: commonly tens to a few hundred Hz (model-dependent)
  • Expected behaviour: when commanded ON, solenoid current should rise and valve should actuate; when commanded OFF, circuit current should drop to near zero
  • High resistance (>spec) or open circuit/infinite ohms indicates coil or wiring fault; short to ground/battery will show low resistance

Diagnostic algorithm

  1. Use an OEM-capable scan tool to record DTCs, freeze frame and live data for solenoid commands and status. Clear codes and see if P0761 returns.
  2. Verify correct transmission fluid level, condition and temperature; top/replace fluid if needed and retest.
  3. Visually inspect the solenoid C electrical connector and harness for damage, corrosion or bent pins; repair any issues.
  4. With ignition off, disconnect solenoid and measure coil resistance across the solenoid pins; compare to OEM specification. Replace solenoid if out of range or open/shorted.
  5. Back-probe the solenoid connector with ignition on and command the solenoid on/off using the scan tool. Observe command voltage, duty cycle and presence of expected current. No voltage or incorrect PWM indicates wiring/TCM problem.
  6. Check continuity between solenoid connector and TCM/PCM connector; check for shorts to ground or battery. Repair wiring as necessary.
  7. If solenoid electrically verifies but problem persists, remove valve body and inspect for debris, stuck valve, or hydraulic wear; clean or rebuild valve body as required.
  8. If valve body and solenoid are good, suspect TCM driver fault—verify by substituting a known-good TCM or performing manufacturer-specific TCM tests.
  9. After repairs, clear codes and perform road test with live-data monitoring to confirm correct solenoid operation and proper shifting.

Likely causes

  • Solenoid C electrical failure (coil open or short)
  • Damaged connector pins or corroded terminals at the solenoid
  • High circuit resistance from damaged wiring or poor ground
  • Debris or varnish preventing valve movement in the valve body
  • Low fluid level or degraded fluid causing abnormal solenoid/valve operation
  • Internal TCM driver fault (less common)

Fault status

⚠️ Status
Transmission control fault: Shift Solenoid C performance/stuck off detected (P0761). Possible solenoid, wiring, valve body contamination, low fluid or TCM issue; may cause limp mode and erratic shifting.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2.0-4.0 hours

Similar codes

P0750 P0755 P0760 P0762 P0740
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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