1994 Chevrolet C/K 2500 Problems: 2 Issues Every Owner Should Know
1994 model year · 0+ owner reports · Updated April 2026
According to Au7o's analysis of 0+ owner reports, the 1994 Chevrolet C/K 2500 has 2 documented known issues, with 1 rated critical. The most serious is 6.5L Diesel Injection Pump (PMD/FSD) Failure ($300-$2,500 repair). Across all issues, repair costs range from $300 to $2,500. DIY maintenance guides at au7o.io.
All 2 Known Issues
On the 1994-2000 Chevrolet C/K 2500 6.5L Diesel, the 6.5L diesel uses a Stanadyne DB2 injection pump with a Pump Mounted Driver (PMD/FSD) electronic module that overheats and fails, causing stalling and no-start conditions. This is the most common failure on 6.5L diesel trucks.
Common Symptoms
- Stalling while driving
- No start when hot
- Hard starting
- Loss of power
How to Fix
Confirm PMD/FSD failure by checking for stall/no-start when hot, verifying power/ground at the injection pump, and scanning for related OBD-I/OBD-II diesel fault codes; a known-good remote-mounted PMD test module is often the quickest confirmation. Replace the failed PMD/FSD with a quality updated module and calibration resistor, then relocate it from the pump to a heat-sink mounted in a cooler area (commonly behind the bumper or grille) using an extension harness to prevent repeat overheating. Inspect and clean injection pump connectors, grounds, and the engine harness during the repair, because poor connections can mimic PMD failure. Parts typically run about $150-$350 for a PMD kit with heat sink and harness, while complete repair cost is usually $250-$600 depending on labor and whether additional wiring repairs are needed.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- UpgradeBluetooth OBD-II scanner for reading engine codes and monitoring live data (BlueDriver Bluetooth OBD2 Diagnostic Scan Tool)
- UpgradeQuality synthetic oil and filter combo for engine maintenance (Mobil 1 Full Synthetic Oil and Filter Bundle)
On the 1990-2000 Chevrolet C/K 2500, same fuel pump failure issue as the C/K 1500. The dual-tank equipped models have an additional failure point with the tank selector valve which can cause fuel starvation.
Common Symptoms
- Engine stalling
- Hard starting
- Loss of power
- Fuel gauge inaccuracy
How to Fix
Confirm the fault by checking fuel pressure at the TBI or CPI rail and verifying pump power/ground at the tank connector; low or unstable pressure, especially under load, usually indicates a failing in-tank pump or restricted strainer. Replace the in-tank fuel pump module, sock/strainer, and fuel filter, and inspect the tank wiring connector for heat damage; on dual-tank trucks, also test the tank selector valve for proper switching and fuel flow because a failed valve can mimic pump failure and cause starvation. If one tank reads incorrectly or the gauge is erratic, inspect the sending unit while the tank is down and replace it if worn. Typical repair cost is about $350-$900 for a single pump job, or $500-$1,200+ on dual-tank models if the selector valve or both sending units need service.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- UpgradeDelphi fuel pump module — OE-quality direct replacement (Delphi Fuel Pump Module)
- UpgradeBosch fuel pump — reliable OEM alternative (Bosch Fuel Pump)