porsche cayenne 1276 hydraulic pump supplier

Pretty self explanatory, P1276 is an electrical fault involving the pump and control network for the PSM and ABS systems. Take a good look at the wiring around the PSM hydraulic unit, I think there is a TSB on moisture entering the harness connector at the PSM.

Hello I have a 2010 cayenne and I have the same issue but I think I know what will be the main problem, a couple weeks I notice water on the carpet at the passenger side I thought that it was the condensation mustuire coming from the ac under the passenger side dash but after a exhausting search I found out that the problem comes from the ducts full of mudge exactly located it on top of the tire and under the abs pump I cleared it from leafs and all kind a dust literally 2 litters of water cane out problem fix! Finally but I’m suspecting because of that the electrical connections may become wet causing the 1276 code anyway I hope this help and probably this week I will dissemble the whale thing in other to check it if y fix it I’ll get back with more details good luck guys

My 2005 Cayenne 4.5S has ABS/PSM fault code 1276. I had the ABS pump unit checked over and it got the all clear about 8 months ago for a different issue. However, I now have fault 1276 but also, without any sign of brake fluid at any calliper or any sign of a leak there is a reasonably quick brake fluid drop. I have filled the reservoir from warning light to full three times in the last six months or so.

Combining these two issues, can anyone direct me to what parts need changing? Struggling to work out if master cylinder, vacuum servo assist or the ABS pump block?

The ABS, short for anti-lock braking system, is a safety feature in Porsche Cayenne which prevents the wheels from locking up during braking. This makes it possible to maintain steerability and directional stability even when braking hard, allowing the driver to avoid obstacles. If the ABS light illuminates in the instrument cluster of Cayenne, it means the anti-lock braking system has malfunctioned.

The ABS light comes on in the dashboard of Porsche Cayenne when one or more of the wheel speed sensors have malfunctioned, brake fluid is too low, the fuse is blown or the relay is bad, tire pressure is low, or if the ABS module has developed a defect.

Porsche Cayenne has an ABS sensor at each wheel hub which measures the speed of the respective wheel and transmits the information to the ABS control unit. If a sensor develops a defect and sends inaccurate or no speed information, the ABS light illuminates in the instrument cluster.

Bad wheel speed sensor is one of the leading causes of ABS warning light in Cayenne, as they are exposed to harsh conditions due to their close proximity to the wheels.

It isn’t usually possible to identify the faulty ABS sensor in Cayenne by physical inspection. The only most reliable method of diagnosing an ABS speed sensor is by connecting an OBDII scanner to your vehicle and reading out the error codes. The error code also makes it easy to determine which sensor is affected. The faulty sensor must be replaced to resolve the issue.

It is possible the sensor is functioning properly in your Cayenne, but the signal is interrupted due to damaged wire or corroded connector. Before replacing the sensor, the wiring and connectors of the affected sensor should be physically inspected for any signs of damage or corrosion.

Excessively low level of brake fluid can trigger ABS light in Cayenne. Check the fluid level in the brake fluid reservoir, the level should sit near the high marking on the reservoir.

In case the brake fluid level is low, topping it off should turn off the ABS warning light in Cayenne. But it is important to further investigate the reason for low brake fluid level. The three common causes of low brake fluid are worn brake pads, worn rotors, and a leak in the system. Check the condition of the brake pads and rotors, also see if there is any sign of fluid leak under your vehicle and on the wheel hubs.

The ABS pump, also called Hydraulic Control Unit (HCU), consists of an electronic and a mechanical-hydraulic part. When you brake hard at high speed and the wheels lock, the hydraulic part of the unit actuates the valves to reduce hydraulic pressure to the brake at the affected wheels. A malfunction in the ABS pump can cause the ABS light to illuminate in Cayenne, and a fault code is stored in the memory. Connect a diagnostic device to your vehicle to read the code.

Low tire pressure in one of the wheels of Porsche Cayenne can cause the ABS light to turn on. The diameter of the wheel is reduced when its tire is underinflated, this causes the wheel to spin faster than other wheels in the vehicle. When the speed difference between the wheels is detected by the control module, an ABS fault code is triggered for the speed sensor of the wheel with low tire pressure.

When the ABS light illuminates in the instrument cluster of Cayenne, the ABS system is disabled and the braking system acts like older traditional braking system. The braking pressure from the master cylinder to the brake calipers is undiminished. What this means is, you can brake normally with moderate braking in dry conditions. But in case of wet or snowy conditions, or when braking hard, you may lose steerability of the vehicle. Therefore, when the ABS light is on, drive with extreme caution and fix the issue as soon as possible.

Resetting the ABS light in Cayenne without solving the underlying issue may not help, as the warning light will turn back on when the system again detects the fault. The light should disappear automatically after fixing the issue. If it doesn’t turn off immediately, driving your vehicle for a few miles should help.

The proper way to reset the ABS light in Cayenne is by clearing the codes with an OBDII scanner. If the warning light doesn’t turn off automatically after fixing the issue, you will have to do it manually by connecting a diagnostic device and then deleting all the error codes related to the ABS system.

If you don’t have a diagnostic device, it may be possible to reset the ABS light in Cayenne by disconnecting the battery for a few minutes. Remove the cable from the negative terminal of the battery first, then from the positive terminal. With the battery disconnected, press the horn button a few times and turn on the headlights to drain out all the residual electricity from the system. After about 15 minutes, reconnect the battery in reverse order: positive cable first, then negative cable.

Since Porsche Cayenne is equipped with on-board diagnostics (OBD), a fault diagnosis can provide initial indications of where the malfunction is located.

To begin troubleshooting, you must first connect the diagnostic tool to your Cayenne. The OBDII connector is usually located under the dashboard. With the tool connected, turn on the ignition. Most diagnostic devices then ask for some information about the vehicle. It is important that you enter this 100% correctly, otherwise the result of the search may be inaccurate. In addition to the vehicle make, model, and engine type, you usually also have to type in the Vehicle Identification Number (VIN). Since some OBD codes are manufacturer-specific, the scanner will be able to give you more accurate information if you enter more details about your Cayenne.

There are many reasons why the ABS light is turned on in your Porsche Cayenne. To pinpoint the cause, you must use a diagnostic tool and scan for codes. For example, if one of the speed sensors has failed, the scanner will tell you exactly which wheel sensor is causing the problem.

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