OBD-II Diagnostic Trouble Code
P1565 — Cruise Control Servo Stuck
P1565 is a manufacturer-specific code that commonly means the cruise control servo or actuator is stuck or not responding to its command. Older systems use a cable-driven servo; newer systems use the electronic throttle, so the exact meaning varies by OEM.
Severity 2/5
Truck-relevant
Service soon
Severity
Service soon
Cruise Control Servo Stuck
Code
P1565
Category
Powertrain
Subsystem
Throttle
Truck-relevant
Yes
What this means for truckers
P1565 (Cruise Control Servo Stuck) — cruise control actuator stuck in one position. Replace cruise servo (on older cable-actuated systems) or recalibrate drive-by-wire system.
Before you replace parts — try this first
P1565 on the Throttle system is most often binding cruise servo cable or throttle linkage — 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
Cruise control will not engage or drops out, and in some cases the throttle may hang or return slowly. A check-engine light may be on.
Common causes
- CommonBinding cruise servo cable or throttle linkage ($150–$500)
- CommonFaulty cruise servo ($200–$600)
- OccasionalWiring or connector fault ($80–$300)
- OccasionalBrake or clutch switch fault ($50–$200)
- RareECM fault ($500–$1800)
How to fix
Inspect cable and throttle linkage for binding
When to use: First step
Test the servo and its circuit
When to use: When the linkage is free
Replace the servo
When to use: When it is faulty
Check brake and clutch switch inputs
When to use: When the servo tests good
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
Frequently Asked Questions
Can I drive with code P1565?
P1565 is severity 2 — service this week. Not an immediate stop, but ignoring it usually compounds the problem. Most common cause for this code is a worn sensor or minor performance fault that won't strand you today but will get more expensive the longer you wait.
How much does it cost to fix P1565 on a commercial truck?
Total repair cost ranges $50–$1800 depending on the root cause. The cheapest fix is usually the first one listed below — Binding cruise servo cable or throttle linkage — 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 P1565 fail a DOT inspection?
P1565 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 P1565 and related codes?
P1565 is closely related to: P1517 (Inferred Engine Coolant Temperature Performance), P1518 (Intake Manifold Runner Control Stuck Open), P1519 (Intake Manifold Runner Control Stuck Closed). These codes share the same subsystem (throttle) 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 P1565 is set without the companions, the issue is more isolated.
How do I prevent P1565 from coming back after a repair?
For P1565 (Cruise Control Servo Stuck), prevention centers on the throttle system. Clean throttle body at 100K mile intervals. Don't let carbon build up. Avoid extended idle time.