OBD-II trouble code
P0569: Cruise Control "Coast" Signal
The deceleration command is faulted. Coast is the least-used button on the assembly, so a fault confined to it is rarely wear — and a coast input stuck asserted is the one cruise fault that produces a real driving complaint rather than a missing feature.
Quick facts
- System
- Powertrain
- Category
- Cruise Control
- Severity
- Low severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $0 – $550
- DIY difficulty
- Intermediate DIY
What does P0569 mean?
P0569 covers the coast command — the input that asks cruise control to reduce speed gradually and adopt whatever speed the vehicle has fallen to when the control is released. It is the least glamorous member of the family and, on most vehicles, by a considerable margin the least used. That last fact turns out to be the most diagnostically useful thing about it.
Contacts in a switch assembly fail as a function of how many times they have been operated. Set is pressed at the start of every journey; resume is pressed every time traffic clears. Coast, by contrast, is a button many drivers press only a handful of times a year, if at all, since lifting off and re-setting achieves much the same result and comes more naturally. So when a fault appears in the coast circuit and nowhere else, ordinary wear is a poor explanation. Something else has usually happened: liquid has been spilled into the pad, moisture has corroded one contact, or a resistance value inside the assembly has drifted. That reframing matters commercially, because it points toward replacing the assembly or cleaning the pad rather than accepting a single worn contact as normal ageing.
The second thing that distinguishes this code is what a stuck input does. Across most of the cruise family, a stuck signal results in the module refusing to arm the system — a missing feature, and an annoyance. Coast is different, because the command it carries is a request to decelerate. If the circuit shorts and the module sees coast asserted continuously, one of two things happens. Either cruise control refuses to engage at all, because the module will not accept a system that is being commanded to slow down at the instant it is asked to hold a speed; or, on some designs, the system engages and then immediately begins bleeding speed away. The driver's description of that second behaviour is that the car will not hold its speed and keeps slowing on its own, which sounds like a fuel delivery problem, a transmission problem or a throttle problem. It gets diagnosed as one surprisingly often, and the actual fault is a shorted wire behind a switch.
That mis-description is the practical value of this page. Someone searching for why their cruise control loses speed is unlikely to be searching for a switch code, and the connection between the two is not obvious from the symptom.
One configuration detail changes the shape of the diagnosis. On many vehicles set and coast are two actions on a single rocker — pressing it captures a speed, holding it coasts down — while on others they are separate controls entirely. Where they share a rocker, this code and the set code appearing together is the expected result of one degraded contact, and should be investigated as a single fault. Where the controls are separate, two codes really do mean two circuits, and the shared elements to suspect become the connector and the clockspring rather than the switch element itself.
Common causes
- Coast circuit shorted to ground, so the module sees a continuous deceleration request
- Contaminated switch pad from liquid ingress, corroding a contact that sees little use
- Drifted resistance value in a resistor ladder assembly, moving the coast step onto a neighbour
- Open circuit in the coast wiring between the switch and the module
- Seized or mechanically stuck rocker holding the coast position
- Corroded connector at the base of the steering column or behind the switch pad
- Cracked clockspring conductor on wheel-mounted controls
- Body or powertrain control module fault, or configuration lost after module replacement
Symptoms
- Cruise control engaged but losing speed on its own without driver input
- Cruise control refusing to engage at all, if the coast input is stuck asserted
- Coast button producing no deceleration while every other cruise function works
- Vehicle decelerating when coast is held but failing to capture the lower speed on release
- The set code stored alongside, where both share one rocker
- Complaint mistaken for a fuel, transmission or throttle problem because of how it feels
- Function returning intermittently in dry weather and failing when damp
- Check engine light with the engine itself running normally
Diagnostic steps
- 1.Determine the direction of the fault before anything else, because the two directions have opposite implications. An open coast circuit means the button does nothing and the driver may not have noticed for months. A coast circuit stuck asserted means the module is being told to decelerate continuously, and that produces a complaint about how the car drives.
- 2.Read the coast input state with the key on and no button pressed. It should be inactive. If it shows a deceleration request at rest, stop looking at the button and start looking for a short to ground on that circuit or a mechanically seized contact.
- 3.Treat a coast-only fault with suspicion rather than accepting it as wear. This is the button drivers use least, in many cases a few times a year, so its contacts have a fraction of the actuation count of set or resume. A contact that has genuinely worn out here while the busier contacts beside it still work perfectly is unusual and suggests contamination or a shifted resistance value affecting the assembly as a whole.
- 4.Compare all the ladder values, not just this one, if the assembly is a resistor ladder. A single drifted value can move one button's voltage onto a neighbouring step, so the coast command may be being decoded as something else while coast's own step goes unclaimed. Measuring every button against the manufacturer's table finds that in a way testing one button never will.
- 5.Test the coast function properly on a road with room to do it. Engage cruise at a steady speed on a clear stretch, hold the coast control, and confirm the vehicle decelerates smoothly and captures the lower speed on release. A vehicle that decelerates but does not capture the new speed is describing a different fault from one that does not decelerate at all.
- 6.Check whether the same rocker also serves the set function. Where set and coast share one physical control distinguished by press duration, this code appearing beside the set code is one contact rather than two faults, and diagnosing them separately wastes time.
Repair cost
$0 – $550
Zero at the bottom covers a connector left unlatched after column work and a switch pad that recovers after being properly cleaned and dried. Diagnosis is $80 to $150, and on this code it is worth insisting the technician establishes whether the input is open or stuck asserted, because those lead to different repairs. A steering wheel switch pad is $30 to $250 in parts plus half an hour to an hour of labour. A column-mounted stalk is $60 to $350 fitted. A clockspring is $150 to $450 including labour and is only implicated when the fault tracks steering angle or several circuits are affected at once. If the complaint was that the car would not hold speed, make sure nobody has already been paid to investigate the fuel or transmission systems on the strength of that description.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with cruise control switch / stalk replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.