P2529 OBD-II Trouble Code: Vacuum Reservoir Press Sensor Circuit Intermmittent

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2529 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2529 code

P2529 is a diagnostic trouble code (DTC) for "Vacuum Reservoir Press Sensor Circuit Intermmittent". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P2529 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P2529 code definition

When a vehicle stores the P2529 code, it’s because its PCM has sensed that the vacuum reservoir pressure sensor circuit is malfunctioning.

What the P2529 code means

The vacuum reservoir pressure sensor circuit plays an important role in bringing your vehicle to a full stop, so it makes sense that your vehicle’s PCM would be designed to monitor this important component closely.

If the vacuum reservoir pressure sensor doesn’t send the PCM a voltage input signal that’s proportionate to the degree of load and engine RPM, the P2529 code will get stored and a Check Engine Light will come on.

Some makes and models will need to go through multiple failure cycles before the light is activated, but a code should still get stored. In these vehicles, if just a single failure is only ever registered, a “pending code” may be stored instead.

What causes the P2529 code?

The most common reason you’ll have a P2529 code stored is because of something affecting the actual vacuum reservoir press directly. This would include things like:

  • A defective vacuum reservoir pressure sensor
  • Vacuum leaks at the vacuum reservoir
  • A defective vacuum pump
  • Broken or cracked vacuum hoses to the vacuum reservoir

Other common causes are:

  • A defective one-way valve located in the vacuum brake booster supply hose
  • Shorted or open electrical circuits or connectors
  • Broken or cracked vacuum hoses to the brake booster

What are the symptoms of the P2529 code?

If the P2529 code has been stored, you’ll most likely realize it the next time you try to hit the brakes. You’ll probably notice it’s harder to push down or depress. Again, the Check Engine light will probably come on too.

In very rare situations, though, the driver may not experience any adverse symptoms caused by the code (or at least none they notice).

How does a mechanic diagnose the P2529 code?

Your mechanic will first assess which codes the vehicle’s PCM has stored by using a code reader. Another tool they’re likely to use to carry out the initial diagnosis is an ohmmeter. They’ll then inspect your vehicle’s wires and connectors. Next, they’ll look at the master cylinder to check for fluid leakage that may be getting into the vacuum brake booster. Vacuum supply hoses will get looked at. Finally, the pressure sensor will be inspected.

Retests of the PCM will have to be done after every repair to continue the diagnosis and, eventually, a test drive too.

Common mistakes when diagnosing the P2529 code

A lot of times, when the problem causing the P2529 code to be stored is a defective vacuum pump motor or defective vacuum pump, many mechanics will first decide to replace the brake boosters or some other component of the vehicle that is vacuum-operated. This erroneous replacement won’t make the code go away and will be unnecessarily costly.

How serious is the P2529 code?

It’s never a good idea to risk driving your vehicle if your brakes aren’t 100%. Although the vacuum reservoir press may assist a number of functions, if your brakes aren’t working right because of sensor issues, this should concern you. While you may still have no problem coming to a full stop for the moment, if that changes, you could get in an accident.

What repairs can fix the P2529 code?

Additional comments for consideration regarding the P2529 code

Keep in mind that more than one problem could be behind the P2529 code. Replacing one broken wire may make it go away for now, but if the sensor isn’t properly examined, it could bring the code back in the near future.

Need help with a P2529 code?

When you need help fixing a P2529 code that’s affecting your vehicle, YourMechanic is here to help. You can complete this online form or just give us a call. Our number is 1-800-701-6230. Either way, we’ll make sure you receive a quote ASAP and can set up a convenient time for one of our certified mobile mechanics to handle diagnosis and repairs. They’ll meet you wherever is convenient – whether it’s your home or workplace.

trouble codes
Check Engine Light
P2529

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2529 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,901

Rating Summary
3,566
166
43
25
101
3,566
166
43
25
101

Richard

18 years of experience
169 reviews
Richard
18 years of experience
Richard was prompt, professional, competent, knowledgeable and helpful. It was a pleasure to work with him.
2005 HUMMER H2 - CHECK ENGINE LIGHT IS ON - FORT MYERS, FLORIDA

Kevin

33 years of experience
47 reviews
Kevin
33 years of experience
Very Kind and informative person.
2006 NISSAN ALTIMA - CHECK ENGINE LIGHT IS ON - FALL RIVER, MASSACHUSETTS

Alex

13 years of experience
405 reviews
Alex
13 years of experience
Alex was very thorough figuring out what was wrong with my car. He was extremely knowledgeable and made me feel very confident that my car would be fixed properly based on his diagnosis.
2002 FORD CROWN VICTORIA - CHECK ENGINE LIGHT IS ON - DALLAS, TEXAS

Tabitha

14 years of experience
106 reviews
Tabitha
14 years of experience
Always thorough, knowledgeable, on time, and friendly.
2010 DODGE AVENGER - CHECK ENGINE LIGHT IS ON - SAN DIEGO, CALIFORNIA

More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...

Related questions

Q: The Check Engine Light comes back on after I reset it

When the Check Engine Light comes on without any specific warning, this can indicate a variety of possible issues. Unfortunately, without more specific symptoms, this can be tough to diagnose without the use of a scanning tool and the skill...

Q: Engine starts up on cold start, shakes/struggles, and then shuts off.

Hello. I'm not sure what is meant by saying the O2 sensor and catalytic converter problem codes were not the problem. Several component issues could cause the behavior you are seeing - from a dirty, clogged, or failing idle air...

Q: Getting P0107 on OBD-II, mostly when car is in reverse gear and the Check Engine Light switches on.

Hi and thanks for contacting YourMechanic. Check the manifold absolute pressure (MAP) sensor for any corrosion or burned pins. This is what the P0107 code is coming up for. Check for power to the sensor. Back probe the wires and...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com