P035D

Code

Generic P — Powertrain

Ignition F Control Signal Circuit/Open

Brand: Generic

Type: P — Powertrain

Views: UK: 18 EN: 38 RU: 27

AI status

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Page language: EN

Causes

Open or damaged wiring in ignition coil F primary/control circuit
Corroded or loose connector at the ignition coil
Failed ignition coil (primary or internal driver)
Failed PCM/ignition driver transistor
Blown ignition fuse or bad relay supplying coil power
Short to ground or short to battery in the coil control wire

Symptoms

Check Engine Light (MIL) on
Misfire on the cylinder served by coil F (rough idle, hesitation)
Reduced engine power or drivability issues
Difficulty starting or no-start if coil is not firing
Increased fuel consumption and emissions

What to check

Read freeze frame and stored data with a scan tool; confirm P035D and related codes (misfire codes)
Clear code and attempt to re-create; note whether code is intermittent or permanent
Visually inspect coil F connector and harness for damage, corrosion, loose pins, or moisture
Check ignition fuse(s) and relays related to coil power
Backprobe coil F connector: verify battery voltage at the power terminal with key on and good ground at the ground/driver terminal
Measure primary coil resistance and compare to specification for the vehicle/coil

Signal parameters

Coil primary supply: ~11–14 V with ignition ON (varies by vehicle)
Primary coil resistance (typical range): ~0.2–2.0 Ω (check exact spec for coil model)
Secondary resistance (typical): ~3 k–15 k Ω (wide range by design)
Driver output: PCM typically switches the primary to ground in pulses (square wave); dwell time varies with engine speed and load (commonly a few ms)
Primary waveform: sharp voltage drop to near 0 V during energize, then a rapid collapse voltage spike on turn-off; absence of switching indicates open/driver fault
Expected pulse frequency: matches engine RPM and firing order; verify pulses are present and synchronized with ignition events

Diagnostic algorithm

Retrieve and record all stored DTCs, freeze frame, and misfire counts. Note whether P035D is current or historic.
Clear codes, run engine and road test to confirm P035D returns. If intermittent, inspect harness routing where it flexes.
Visual inspection: disconnect battery negative if required by manufacturer; inspect connector, pins, insulation and harness for damage, corrosion, or moisture. Repair any obvious faults.
Verify coil power and ground: backprobe connector with key ON/engine cranking. Confirm battery voltage at power terminal and check continuity to chassis/PCM ground as applicable.
Measure primary coil resistance with DMM; compare to manufacturer spec. If open or out of range, replace coil.
Perform continuity check from coil control pin to PCM pin with connector(s) disconnected; check for opens/shorts to ground/battery. Repair wiring as needed.
Swap coil F with another cylinder’s coil (if identical) and see if P035D follows the coil. If it does, replace the coil; if it stays on original position, suspect wiring/PCM.
Use an oscilloscope to view the primary driver waveform at the coil while cranking/running: confirm PCM is commanding the coil (switching pulses). If PCM is not commanding but wiring/power are good, suspect PCM driver fault.
Check related fuses/relays and replace if faulty. After repairs, clear codes and verify proper operation and no recurrence.
If wiring and coil check good and PCM output is incorrect or missing, consult manufacturer service manual for PCM diagnosis/repair or replacement procedures.

Likely causes

Loose/corroded connector at coil F
Broken or chafed wire in the coil F harness (open circuit)
Failed ignition coil F (internal open in primary)
Failed PCM ignition driver output for coil F
Blown fuse or faulty relay supplying coil power

Fault status

⚠️ Status

Ignition Coil F Control Circuit/Open detected — open or fault in the primary/control circuit for ignition coil F. Inspect coil, wiring, connectors, fuses, and PCM driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours