OBD-II Diagnostic Trouble Code
P0607 — Control Module Performance
P0607 means the control module detected an internal performance problem. That's a generic internal-fault code covering things like internal voltage regulation, driver circuits, or self-check routines not performing correctly. What exactly it monitors varies by manufacturer.
Severity 4/5
Truck-relevant
Stop within 50 mi
Severity
Stop within 50 mi
Control Module Performance
Code
P0607
Category
Powertrain
Subsystem
Network
Truck-relevant
Yes
What this means for truckers
P0607 (Control Module Performance) — generic ECM performance code.
Before you replace parts — try this first
P0607 on the Network system is most often low battery voltage, a charging problem or poor module grounds — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
The check-engine light is on, possibly with a derate, a limp mode, erratic idle, intermittent stalling or shifting problems, depending on which module set it. Some trucks show no driveability change at all.
Common causes
- CommonLow battery voltage, a charging problem or poor module grounds ($100–$500)
- CommonInternal module fault ($1200–$3500)
- OccasionalSoftware issue fixed by a manufacturer update ($150–$450)
- OccasionalShorted external circuit overloading a module output ($150–$800)
How to fix
Check the batteries, the charging output, and the module power and ground voltage drop
When to use: First step
Check for other codes that point to a shorted sensor or actuator, and repair those first
When to use: When other codes are stored with it
Reflash with the latest calibration
When to use: When the power supply is good
Replace and program the module
When to use: When the code comes back after the steps above
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → P0670 — Glow Plug Control Module Circuit
- → P0671 — Cylinder 1 Glow Plug Circuit
- → P0672 — Cylinder 2 Glow Plug Circuit
- → P0673 — Cylinder 3 Glow Plug Circuit
- → P0674 — Cylinder 4 Glow Plug Circuit
Frequently Asked Questions
Can I drive with code P0607?
Drive with caution. P0607 is severity 4 — stop within ~50 miles. Most commercial diesel codes at this severity (turbo, fuel rail, transmission solenoid) can damage adjacent expensive components if left unrepaired. Get to a service location before highway-speed loads.
How much does it cost to fix P0607 on a commercial truck?
Total repair cost ranges $100–$3500 depending on the root cause. The cheapest fix is usually the first one listed below — Low battery voltage, a charging problem or poor module grounds — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will P0607 fail a DOT inspection?
P0607 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between P0607 and related codes?
P0607 is closely related to: P0670 (Glow Plug Control Module Circuit), P0671 (Cylinder 1 Glow Plug Circuit), P0672 (Cylinder 2 Glow Plug Circuit), P0673 (Cylinder 3 Glow Plug Circuit). These codes share the same subsystem (network) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only P0607 is set without the companions, the issue is more isolated.
How do I prevent P0607 from coming back after a repair?
For P0607 (Control Module Performance), prevention centers on the network system. Pay attention to ground connections at every PM — bad grounds are 70% of communication codes. Inspect harness routing for chafe points. Don't disconnect modules with the key on.