P0320: Ignition/Distributor Engine Speed Input Circuit Malfunction
7 vehicles · 4 makes · $30-$550 repair
Most Reported On
P0320 is an OBD-II diagnostic trouble code meaning “Ignition/Distributor Engine Speed Input Circuit Malfunction.” The ECM/PCM detected a malfunction in the ignition or distributor engine-speed (RPM) input circuit. This circuit supplies the engine-speed reference used for spark timing and fuel control; a general fault here (open, short, or signal loss) is flagged as P0320. On distributorless systems this maps to the crank/ignition RPM reference. This code is most commonly reported on 1990-1999 Jeep Cherokee (SE, Sport, Classic, Country, Limited), 1990-1996 Ford Bronco (XLT, Eddie Bauer, Custom, Silver Anniversary), and 1999-2004 Jeep Grand Cherokee, plus 4 other vehicles, with repair costs ranging from $30 to $550.
Common Causes
Typical Repair Cost
Based on 7 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P0320.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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Vehicles Affected (7)
Crankshaft Position Sensor (CPS) Failure Causes Intermittent No-Start and Hot Stalling
4.7L V8 Crankshaft Position Sensor Failure Causing Hot-Restart No-Start and Random Stalling
4.0L Crankshaft Position Sensor Thermal Failure — Random Stalling & Hot No-Start
FAQ
What does P0320 mean?
P0320 stands for "Ignition/Distributor Engine Speed Input Circuit Malfunction." The ECM/PCM detected a malfunction in the ignition or distributor engine-speed (RPM) input circuit. This circuit supplies the engine-speed reference used for spark timing and fuel control; a general fault here (open, short, or signal loss) is flagged as P0320. On distributorless systems this maps to the crank/ignition RPM reference.
What are the most common causes of P0320?
The most common causes of P0320 are: Faulty crankshaft/distributor RPM pickup sensor, Damaged wiring or connector in the RPM input circuit, Poor ground or corroded connector, Faulty ignition module, Air gap or damaged reluctor/trigger wheel. The specific cause varies by vehicle.
How much does it cost to fix P0320?
Repair costs for P0320 range from $30 to $550, depending on the vehicle and root cause.
Which vehicles are affected by P0320?
Au7o has documented P0320 across 7 vehicle models from 4 manufacturers: Ford, Jeep, Mazda, RAM.
Sources (12)
- ForumNo Start Troubleshooting (Cam and Crank Sensors) - Jeep Cherokee Forum
- ForumCrank but no start when hot - NAXJA Forums
- articleJeep Cherokee XJ - Crankshaft Position Sensor Issue - NewParts
- NHTSANHTSA Manufacturer Communications Data Corpus
- Manual2004 Jeep Grand Cherokee 4.7L Service Manual: P0320 Diagnostic
- Manual2004 Jeep Grand Cherokee 4.7L Service Manual: CKP Sensor Service
- RecallNHTSA 04V-112: 2004 Grand Cherokee 4.0L CKP Recall Population
- articleCam Sensor Failure Causing No Start or Stalling: Dodge Ram 1500 - RepairPal
- ForumI solved my camshaft sensor issue - RamForumZ
- ForumNo Start After Distributor Cap Replacement on Mazda Protege (RepairPal)
- Forum91 Protege no spark at plugs - distributor trigger diagnosis (Mazda Forum)
- ForumStalling when hot - 1st Gen Protege distributor (Mazda3Club)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.