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Home / DTC / P1837 — Pressure control valve short

P1837 — Pressure control valve short

Detailed page for trouble code P1837.

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Code

P1837

MITSUBISHI P — Powertrain

Pressure control valve short

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground in pressure control valve/solenoid wiring
  • Short to battery voltage (short to power) in wiring
  • Open or damaged wiring/connector (intermittent short)
  • Corroded or pushed‑out connector pins or water ingress
  • Failed pressure control valve / solenoid (internal short)
  • Faulty transmission control module (ECU) output driver

Symptoms

  • Transmission may go into limp/limitation mode
  • Harsh, delayed, or incorrect shifting
  • Stuck in one gear or failure to shift
  • Transmission warning lamp (AT or Check Engine) illuminated
  • Reduced driveability and abnormal engine/transmission noise
  • Possible electrical smells or visible melted insulation in severe shorts

What to check

  • Read and record freeze frame and all stored codes; clear codes and attempt to re‑create
  • Visual inspection of pressure control valve/solenoid connector and wiring for corrosion, pin damage, melted insulation, or chafing
  • Backprobe connector and check for voltage supply and ground with key ON
  • Measure coil resistance of the pressure control valve/solenoid (compare to spec)
  • Check for short to battery (12 V) and short to ground at the solenoid connector with multimeter
  • Wiggle test wiring while monitoring voltage/ohms and running through gear selection

Signal parameters

  • Supply voltage (key ON): ~12 V present at solenoid power feed (verify vehicle spec)
  • Solenoid coil resistance: typically low ohms (example ranges often ~8–40 Ω depending on design) — check OEM spec
  • Control signal: PWM duty cycle commanded by TCU from ~0% to 100% (varies by load/gear)
  • When commanded OFF: control output should not be shorted to battery (no full 12 V) or to ground unexpectedly
  • When commanded ON: back‑probe voltage should show PWM/voltage corresponding to duty command (not constant short)

Diagnostic algorithm

  1. Verify the code: retrieve all transmission and engine codes, note freeze frame data, and confirm P1837 presence after clearing.
  2. Visual inspection: examine connector, harness, and transmission case for damage, corrosion, or fluid intrusion.
  3. Check supply/ground: with connector connected, measure battery supply at the solenoid power feed and verify good ground reference.
  4. Resistance test: with ignition OFF and connector disconnected, measure solenoid coil resistance and compare to OEM spec; very low resistance suggests internal short.
  5. Short checks: with ignition OFF, check continuity from solenoid power pin to battery positive (should be open when circuit not energized) and from control pin to ground (should be open) to detect shorts to power/ground.
  6. Active test / oscilloscope: command the solenoid with a bi‑directional scan tool and observe control waveform and supply on back‑probe or oscilloscope to confirm PWM behavior vs. short.
  7. Isolate component: if wiring/connector look suspect, disconnect harness and test continuity between harness and ECU; if available, substitute a known good solenoid.
  8. Repair: repair or replace damaged wiring, connectors, or solenoid as indicated. Replace ECU only after wiring and component faults are ruled out.
  9. Verify repair: clear codes, perform road test and monitor PIDs and for return of DTC; recheck after heat/cool cycles if intermittent.

Likely causes

  • Damaged/frayed harness near transmission or chassis (short to ground)
  • Corroded connector at pressure control valve causing low resistance path
  • Failed solenoid coil with internal short
  • ECU output transistor failure (less common)
  • Aftermarket wiring or previous repairs with poor routing/insulation

Fault status

⚠️ Status
Pressure control valve/solenoid circuit short detected. ECU has logged a short to power or ground (or abnormally low resistance) on the transmission pressure control output. This can compromise hydraulic pressure control and shifting performance.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 hours

Similar codes

P0778 P0751 P0746 P1836 P1838
406

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